There are a total of 15 6-letter words containing 'fen', and the number may vary in different dictionaries. You can specify the dictionary and order.

• deafen ₁₁
• defend ₁₂
• fenced ₁₄
• fencer ₁₃
• fences ₁₃
• fended ₁₂
• fender ₁₁
• fening ₁₃
• fennec ₁₄
• fennel ₁₂
• offend ₁₄
• fenman ₁₁
• fenmen ₁₁
• halfen ₁₂
• turfen ₉

There are 15 6-letter words containing fen in the well-known word game dictionary, 11 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 14 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 11 in the Words with Friends (WWF) dictionary.