There are a total of 39 6-letter words containing 'nis', and the number may vary in different dictionaries. You can specify the dictionary and order.

• adonis ₈
• agnise ₉
• anises ₇
• anisic ₁₀
• banish ₁₂
• bennis ₁₁
• blinis ₁₁
• danish ₁₀
• dhonis ₁₀
• enisle ₈
• eonism ₁₀
• finish ₁₂
• ionise ₇
• jinnis ₁₇
• linish ₁₀
• minish ₁₂
• monish ₁₂
• monism ₁₃
• monist ₁₀
• nanism ₁₁
• ngonis ₁₀
• niseis ₇
• pennis ₁₁
• punish ₁₃
• tanist ₇
• tennis ₈
• tonish ₉
• unisex ₁₅
• unison ₉
• vanish ₁₃
• winish ₁₂
• bonism ₁₀
• bonist ₈
• inisle ₆
• nisgul ₇
• nishes ₉
• nisses ₆
• panisc ₁₀
• panisk ₁₂

There are 39 6-letter words containing nis in the well-known word game dictionary, 27 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 37 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 31 in the Words with Friends (WWF) dictionary.