There are a total of 53 9-letter words containing 'pop', and the number may vary in different dictionaries. You can specify the dictionary and order.

• antipopes ₁₆
• apophatic ₂₀
• apophyges ₂₁
• apophyses ₁₉
• apophysis ₁₉
• apoptosis ₁₅
• apoptotic ₁₈
• epopoeias ₁₅
• eyepopper ₂₀
• hypoploid ₂₁
• hypopneas ₂₀
• hypopyons ₂₂
• joypopped ₃₀
• joypopper ₂₉
• lollipops ₁₈
• lollypops ₂₀
• popinjays ₂₇
• popliteal ₁₇
• poppadoms ₂₂
• poppadums ₂₃
• poppycock ₃₀
• poppyhead ₂₃
• popstrels ₁₆
• poptastic ₁₈
• populaces ₂₀
• popularly ₂₀
• populated ₁₈
• populates ₁₇
• populisms ₂₀
• populists ₁₇
• powerpops ₂₁
• unpopular ₁₉
• apophases ₁₆
• apophasis ₁₆
• apoptoses ₁₃
• hypopneic ₂₁
• popliteus ₁₃
• poppliest ₁₅
• poppyseed ₁₉
• popsicles ₁₅
• synthpops ₁₉
• technopop ₁₈
• apoplasts ₁₃
• apoplexed ₂₁
• apoplexes ₂₀
• hypophyge ₂₆
• hypopnoea ₁₉
• lipoplast ₁₃
• popehoods ₁₇
• popelings ₁₄
• popeships ₁₈
• popjoying ₂₄
• poppering ₁₆

There are 53 9-letter words containing pop in the well-known word game dictionary, 38 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 49 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 32 in the Words with Friends (WWF) dictionary.