There are a total of 28 10-letter words containing 'root', and the number may vary in different dictionaries. You can specify the dictionary and order.

• arrowroots ₁₃
• birthroots ₁₅
• bitterroot ₁₃
• bloodroots ₁₅
• colicroots ₁₇
• coralroots ₁₄
• disrooting ₁₄
• gingerroot ₁₅
• grassroots ₁₂
• orrisroots ₁₀
• outrooting ₁₄
• puttyroots ₁₆
• rootedness ₁₂
• rootstocks ₁₇
• scrootched ₁₉
• scrootches ₁₈
• snakeroots ₁₅
• squawroots ₂₃
• breadroots ₁₃
• briarroots ₁₂
• brierroots ₁₂
• feverroots ₁₆
• rootstalks ₁₄
• chinaroots ₁₅
• dragonroot ₁₂
• rootserver ₁₃
• rootsiness ₁₀
• uprootings ₁₃

There are 28 10-letter words containing root in the well-known word game dictionary, 23 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 28 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 18 in the Words with Friends (WWF) dictionary.