There are a total of 22 11-letter words containing 'key', and the number may vary in different dictionaries. You can specify the dictionary and order.

• chromakeyed ₂₆
• donkeyworks ₂₆
• hokeynesses ₂₀
• hokeypokeys ₂₈
• jockeyships ₃₄
• keyboarders ₂₁
• keyboarding ₂₄
• keyboardist ₂₁
• keyloggings ₂₅
• keypunchers ₂₇
• keypunching ₃₀
• keystroking ₂₄
• monkeyshine ₂₄
• outjockeyed ₃₁
• rekeyboards ₂₁
• turkeycocks ₂₈
• monkeypoxes ₂₉
• dickeybirds ₂₄
• flunkeydoms ₂₄
• flunkeyisms ₂₃
• monkeygland ₂₂
• whiskeyfied ₂₈

There are 22 11-letter words containing key in the well-known word game dictionary, 13 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 18 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 16 in the Words with Friends (WWF) dictionary.