There are a total of 42 9-letter words containing 'fen', and the number may vary in different dictionaries. You can specify the dictionary and order.

• bedeafens ₁₇
• deafening ₁₇
• defendant ₁₆
• defenders ₁₅
• defending ₁₈
• defensing ₁₇
• defensive ₁₈
• fenagling ₁₉
• fenceless ₁₇
• fencepost ₁₉
• fencerows ₁₉
• fencibles ₂₀
• fenestrae ₁₃
• fenestral ₁₄
• fenthions ₁₆
• fenugreek ₂₀
• forefends ₁₇
• forfended ₁₈
• ibuprofen ₂₀
• offenders ₁₇
• offending ₂₀
• offensive ₂₀
• refencing ₁₉
• reoffends ₁₇
• ringfence ₁₉
• stiffened ₁₇
• stiffener ₁₆
• tamoxifen ₂₃
• unfencing ₂₁
• wulfenite ₁₈
• baclofens ₁₆
• defencing ₁₆
• fenceline ₁₄
• fencewire ₁₇
• fentanyls ₁₅
• outfenced ₁₅
• outfences ₁₄
• unstiffen ₁₅
• fencelike ₁₈
• fenestras ₁₂
• pfennings ₁₅
• unberufen ₁₄

There are 42 9-letter words containing fen in the well-known word game dictionary, 36 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 37 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 30 in the Words with Friends (WWF) dictionary.