There are a total of 126 10-letter words containing 'uni', and the number may vary in different dictionaries. You can specify the dictionary and order.

• ammunition ₁₉
• communions ₂₂
• communique ₃₁
• communised ₂₂
• communises ₂₁
• communisms ₂₄
• communists ₂₁
• communized ₃₁
• communizes ₃₀
• disunities ₁₃
• disuniting ₁₆
• funiculars ₂₀
• immunisers ₁₈
• immunising ₂₁
• immunities ₁₈
• immunizers ₂₇
• immunizing ₃₀
• impunities ₁₈
• interunion ₁₄
• jejunities ₃₀
• juniorates ₂₁
• multiunion ₁₈
• municipals ₂₂
• munificent ₂₂
• munitioned ₁₇
• munitioner ₁₆
• neptuniums ₂₀
• nonuniform ₂₀
• picayunish ₂₂
• praemunire ₁₈
• preuniting ₁₈
• puninesses ₁₆
• punishable ₂₁
• punishment ₂₁
• punitively ₂₂
• reunifying ₂₀
• reunionist ₁₃
• tradeunion ₁₄
• triunities ₁₂
• uniaxially ₂₃
• unicameral ₁₉
• unicolored ₁₇
• unicuspids ₂₀
• unicyclist ₂₁
• unifoliate ₁₆
• uniformest ₁₈
• uniforming ₂₁
• uniformity ₂₀
• unilateral ₁₄
• unilingual ₁₈
• unilocular ₁₈
• unimagined ₁₉
• unimodular ₁₈
• unimpaired ₁₉
• unimposing ₂₁
• unimproved ₂₃
• unindicted ₁₈
• uninfected ₂₀
• uninflamed ₂₁
• uninflated ₁₈
• uninformed ₂₀
• uninitiate ₁₃
• uninspired ₁₇
• uninstalls ₁₅
• unintended ₁₆
• uninterest ₁₃
• uninviting ₂₀
• uninvolved ₂₃
• unionising ₁₆
• unionistic ₁₆
• unionizing ₂₅
• uniqueness ₂₃
• unitarians ₁₃
• unitarists ₁₂
• unitholder ₁₆
• univalents ₁₈
• univariate ₁₆
• universals ₁₇
• university ₁₈
• univocally ₂₃
• unpunished ₂₀
• disuniters ₁₁
• unicycling ₁₈
• uninsureds ₁₁
• unionizers ₁₉
• unununiums ₁₂
• bhikkhunis ₂₆
• communings ₁₇
• duniwassal ₁₄
• fortunised ₁₄
• fortunises ₁₃
• fortunized ₂₃
• fortunizes ₂₂
• funiculate ₁₅
• luninesses ₁₀
• munifience ₁₇
• reunionism ₁₂
• reunitable ₁₂
• unicentral ₁₂
• unicostate ₁₂
• unidealism ₁₃
• uniflorous ₁₃
• unilabiate ₁₂
• uniliteral ₁₀
• unilobular ₁₂
• unimmortal ₁₄
• unimparted ₁₅
• unimplored ₁₅
• uninclosed ₁₃
• unindeared ₁₂
• uninforced ₁₆
• uninuclear ₁₂
• uninvested ₁₄
• unionisers ₁₀
• unipartite ₁₂
• uniseptate ₁₂
• uniseriate ₁₀
• unisonally ₁₃
• unisonance ₁₂
• unitedness ₁₁
• univalence ₁₅
• univalency ₁₈
• univariant ₁₃
• univoltine ₁₃
• wharepunis ₁₈
• whodunitry ₂₀

There are 126 10-letter words containing uni in the well-known word game dictionary, 75 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 121 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 81 in the Words with Friends (WWF) dictionary.