There are a total of 29 11-letter words containing 'yer', and the number may vary in different dictionaries. You can specify the dictionary and order.

• ballplayers ₂₂
• bricklayers ₂₄
• butterflyer ₂₁
• cardplayers ₂₁
• doomsdayers ₁₈
• horseplayer ₁₉
• interlayers ₁₅
• lammergeyer ₂₂
• longplayers ₂₁
• multilayers ₁₉
• multiplayer ₂₂
• overstayers ₁₇
• platelayers ₁₈
• prayerbooks ₂₃
• prayerfully ₂₄
• roleplayers ₁₈
• soothsayers ₁₅
• superlawyer ₂₁
• superplayer ₂₁
• swordplayer ₂₁
• tracklayers ₂₁
• tumbledryer ₂₂
• cherimoyers ₂₁
• contrayerva ₁₉
• delayerings ₁₆
• drainlayers ₁₅
• underlayers ₁₅
• yersinioses ₁₄
• yersiniosis ₁₄

There are 29 11-letter words containing yer in the well-known word game dictionary, 16 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 24 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 22 in the Words with Friends (WWF) dictionary.