There are a total of 30 8-letter words containing 'zen', and the number may vary in different dictionaries. You can specify the dictionary and order.

• bedizens ₂₂
• benzenes ₂₂
• brazened ₂₂
• brazenly ₂₄
• chazzens ₃₂
• citizens ₂₁
• cozenage ₂₃
• cozeners ₂₁
• cozening ₂₄
• denizens ₂₀
• dizening ₂₂
• dozening ₂₂
• dozenths ₂₁
• fazendas ₂₂
• frozenly ₂₄
• khazenim ₂₇
• lozenges ₂₁
• netizens ₁₉
• refrozen ₂₁
• unfrozen ₂₃
• wizening ₂₄
• zenaidas ₁₉
• zenithal ₂₁
• brazenry ₂₂
• defrozen ₂₁
• enfrozen ₂₀
• gizzened ₂₈
• lozenged ₁₉
• weazened ₂₁
• wizenest ₂₀

There are 30 8-letter words containing zen in the well-known word game dictionary, 23 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 30 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 23 in the Words with Friends (WWF) dictionary.