Bottom noun - The part of the body upon which someone sits.
Usage example: the baby fell backwards onto her bottom
Behind is a synonym for bottom in rear end topic. In some cases you can use "Behind" instead a noun "Bottom", when it comes to topics like buttocks, over. informal substitute
Behind noun - The part of the body upon which someone sits.
Usage example: cleaned the baby's behind
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Google Ngram Viewer shows how "bottom" and "behind" have occurred on timeline