There are a total of 571 10-letter words ending in 'ion', and the number may vary in different dictionaries. You can specify the dictionary and order.
- abdication 18
- aberration 14
- abjuration 24
- abnegation 17
- abreaction 17
- abrogation 16
- abscission 17
- absolution 16
- absorption 17
- abstention 15
- accusation 18
- activation 18
- adaptation 15
- adhibition 17
- adjunction 26
- adjuration 22
- admiration 15
- admonition 16
- adsorption 15
- advocation 19
- affixation 24
- affliction 21
- aggression 15
- alienation 13
- alkylation 19
- allegation 15
- allocation 16
- allocution 17
- alteration 12
- ambulation 19
- ammunition 19
- amputation 18
- angulation 16
- annexation 20
- annotation 13
- annulation 15
- apparition 17
- apposition 17
- arrogation 13
- ascription 17
- aspiration 14
- assumption 18
- attraction 14
- automation 15
- bilocation 18
- bloviation 19
- butylation 18
- byelection 20
- capitation 17
- carination 15
- castration 14
- catenation 15
- cavitation 18
- centillion 17
- claymation 20
- coaptation 17
- cochampion 25
- cofunction 22
- cogitation 16
- coldfusion 20
- collection 19
- coloration 15
- combustion 21
- commission 20
- compaction 23
- compassion 20
- completion 21
- complexion 28
- compulsion 22
- conception 21
- concession 18
- conclusion 20
- concoction 21
- concretion 18
- concussion 19
- conduction 20
- confection 21
- confession 18
- conflation 19
- congestion 17
- connection 19
- conniption 19
- contention 16
- contortion 15
- contrition 15
- convection 22
- convention 20
- conversion 19
- conviction 22
- convulsion 21
- cooptation 17
- copulation 19
- corelation 15
- coronation 15
- corotation 14
- correction 17
- corruption 18
- counterion 16
- cumulation 20
- cunctation 19
- deaeration 12
- decimation 18
- declension 17
- decoration 15
- decryption 20
- dedication 16
- defamation 18
- defecation 18
- definition 16
- deflection 19
- delegation 15
- deliration 13
- demolition 16
- denegation 15
- denotation 13
- denudation 15
- depilation 16
- deposition 15
- depression 15
- depuration 16
- deputation 16
- derivation 16
- derogation 14
- descension 16
- desolation 13
- desorption 15
- detonation 13
- detraction 15
- devolution 18
- digitation 14
- digression 14
- dilatation 13
- diminution 17
- discission 15
- disclusion 17
- discretion 15
- discussion 16
- dismission 15
- dispassion 15
- dispersion 15
- displosion 16
- disruption 16
- dissection 15
- dissension 13
- dissention 13
- dissuasion 13
- distension 13
- distention 13
- distortion 12
- divagation 18
- divination 17
- domination 16
- dubitation 16
- ebullition 17
- ecofashion 19
- elongation 15
- eluviation 17
- emaciation 17
- emendation 16
- emigration 16
- encryption 20
- enervation 16
- epilimnion 19
- equitation 21
- eructation 15
- escalation 15
- estimation 14
- estivation 15
- etiolation 12
- evacuation 19
- evaluation 17
- exaltation 19
- exaptation 21
- excavation 25
- excerption 24
- excitation 21
- execration 21
- exhalation 21
- exhaustion 21
- exhibition 23
- exhumation 24
- expedition 22
- expiration 21
- exposition 21
- expression 21
- expunction 26
- exsolution 20
- extinction 22
- extraction 21
- exultation 20
- exuviation 23
- fabulation 19
- fanfiction 21
- fasciation 17
- federation 15
- figuration 17
- filtration 15
- flirtation 15
- floatation 15
- floriation 15
- foundation 17
- fumigation 20
- gemination 17
- generation 14
- glaciation 17
- gleization 23
- gorgoneion 16
- graduation 15
- habitation 16
- hebetation 16
- herniation 14
- hesitation 13
- illocution 17
- imbibition 20
- immolation 18
- impanation 18
- imposition 17
- impression 17
- imputation 18
- incitation 15
- incohesion 17
- incubation 19
- indagation 15
- indecision 16
- indexation 20
- indication 16
- induration 14
- infarction 18
- infixation 22
- inflection 19
- infliction 19
- infraction 18
- ingression 14
- inhalation 15
- inhibition 17
- inhumation 18
- initiation 12
- injunction 26
- innovation 17
- insolation 13
- inspection 18
- insulation 14
- interunion 14
- intimation 15
- intinction 16
- intonation 13
- intubation 16
- inundation 15
- invitation 16
- invocation 19
- involution 18
- iodination 13
- iodisation 12
- iodization 21
- ionisation 12
- ionization 21
- irreligion 14
- irrigation 13
- irritation 11
- jubilation 25
- laceration 15
- lamination 16
- laureation 13
- levigation 18
- levitation 16
- liberation 15
- limitation 15
- literation 12
- litigation 14
- lobulation 17
- locomotion 18
- lustration 13
- maceration 17
- maculation 19
- marination 15
- maturation 15
- medication 18
- meditation 15
- menologion 18
- midsection 18
- miscaption 20
- misprision 17
- mitigation 16
- moderation 15
- modulation 17
- morulation 16
- motivation 18
- multiunion 18
- mutilation 16
- navigation 18
- nodulation 15
- nomination 16
- nonfiction 19
- nucleation 17
- numeration 16
- obligation 17
- obturation 15
- occupation 21
- opposition 17
- oppression 17
- ordination 13
- osculation 16
- outstation 12
- overaction 18
- pagination 17
- palliation 16
- patination 15
- peculation 19
- pedication 18
- pennillion 18
- perception 20
- percussion 18
- perfection 20
- perihelion 17
- permeation 17
- permission 17
- peroration 14
- persuasion 15
- perversion 18
- pincushion 21
- pixelation 22
- pixilation 22
- plantation 16
- population 19
- possession 14
- postillion 16
- precaution 18
- precession 17
- preclusion 19
- prediction 18
- preemption 20
- prehension 17
- prelection 18
- preportion 17
- pretension 15
- prevention 19
- procession 17
- production 19
- profession 17
- projection 26
- proportion 17
- propulsion 19
- protection 17
- protrusion 15
- pultrusion 17
- punctation 19
- quaternion 22
- readoption 15
- recitation 14
- recreation 14
- redemption 18
- redivision 16
- reelection 15
- reemission 14
- reflection 18
- refraction 17
- refutation 15
- regelation 14
- regression 13
- regulation 15
- reignition 14
- reinvasion 16
- relaxation 19
- relegation 14
- relocation 15
- renovation 16
- reparation 14
- repetition 14
- reposition 14
- repression 14
- reputation 15
- rescission 14
- resolution 13
- resonation 12
- resorption 14
- resumption 18
- retraction 14
- revelation 16
- revocation 18
- revolution 17
- rumination 16
- salivation 16
- salutation 13
- sanitation 12
- saturation 12
- separation 14
- septillion 16
- sextillion 20
- sibilation 15
- simulation 16
- sonication 15
- spallation 16
- speciation 17
- spoliation 15
- squamation 24
- stagnation 14
- starvation 15
- staycation 16
- storiation 11
- subduction 20
- subjection 27
- submersion 18
- submission 18
- subreption 18
- subsection 18
- substation 15
- subvention 20
- subversion 19
- succession 18
- succussion 19
- suggestion 16
- supination 16
- suppletion 19
- surjection 24
- suspension 16
- tabulation 16
- television 16
- temptation 17
- titivation 15
- titubation 15
- toleration 12
- trabeation 14
- tradeunion 14
- trajection 23
- transition 12
- trisection 14
- triskelion 16
- tritiation 11
- truncation 16
- ulceration 16
- undulation 16
- urtication 15
- usucaption 19
- usurpation 16
- validation 17
- vegetation 17
- velitation 16
- veneration 16
- vermillion 20
- vesication 18
- visitation 15
- waystation 16
- zwitterion 23
- reenvision 13
- reinfusion 13
- abjunction 21
- abstersion 12
- accubation 16
- acervation 15
- acieration 12
- acroterion 12
- agregation 12
- alineation 10
- alligation 11
- ampliation 14
- anhelation 13
- appetition 14
- aprication 14
- arefaction 15
- areolation 10
- astriction 12
- balneation 12
- cameration 14
- canulation 12
- cineration 12
- cohibition 17
- commixtion 23
- compursion 16
- consension 12
- correption 14
- cribration 14
- crispation 14
- crustation 12
- datamation 13
- dealbation 13
- defunction 16
- degression 12
- delibation 13
- deligation 12
- denisation 11
- denization 20
- diremption 15
- discursion 13
- disgestion 12
- disjection 20
- eburnation 12
- emollition 12
- enarration 10
- eradiation 11
- ethylation 16
- fugitation 14
- futurition 13
- gleisation 11
- horologion 14
- ignoration 11
- immanation 14
- imminution 14
- inchoation 15
- inequation 19
- irrelation 10
- jaculation 19
- judication 20
- jugulation 18
- lapidation 13
- latitation 10
- leviration 13
- loculation 12
- lorication 12
- lumination 12
- malaxation 19
- malleation 12
- maximation 21
- militation 12
- nanisation 10
- nanization 19
- nauseation 10
- neglection 13
- nidulation 11
- obduration 13
- objuration 19
- obsoletion 12
- obvolution 15
- ocellation 12
- omophorion 17
- oppilation 14
- oscitation 12
- outpassion 12
- papulation 14
- patriation 12
- pejoration 19
- phaelonion 15
- porrection 14
- presension 12
- prestation 12
- propension 14
- protension 12
- provection 17
- pundigrion 14
- pyramidion 18
- quartation 19
- racemation 14
- radication 13
- rascallion 12
- recusation 12
- remigation 13
- renegation 11
- rumbullion 14
- sagination 11
- scrunchion 17
- semination 12
- sideration 11
- sticharion 15
- stupration 12
- subception 16
- sufflation 16
- sulphation 15
- superation 12
- sustention 10
- suturation 10
- symphonion 20
- synaxarion 20
- tidivation 14
- toxication 19
- traduction 13
- tubulation 12
- umbonation 14
- ustulation 10
- vapulation 15
- volitation 13
- volutation 13
- xanthation 20
There are 571 10-letter words ending in ion in the well-known word game dictionary, 406 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 554 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 443 in the Words with Friends (WWF) dictionary.
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