Buttocks noun - The part of the body upon which someone sits.
Usage example: she slipped in the mud puddle and hit the ground square on her buttocks
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Synonyms for Buttocks
Butt noun - The fleshy part of the human body that you sit on.
Usage example: he deserves a good kick in the butt
Buttocks is a synonym for butt in bottom topic. You can use "Buttocks" instead a noun "Butt", if it concerns topics such as arse, tail, backside. popular alternative
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Google Ngram Viewer shows how "buttocks" and "butt" have occurred on timeline