hindquarters vs fanny

hindquarters and fanny both are nouns.

Word	Noun	Adjective	Verb	Adverb
hindquarters	Yes	No	No	No
fanny	Yes	No	No	No

As nouns, hindquarters and fanny are synonyms defined as:

hindquarters and fanny: the fleshy part of the human body that you sit on

hindquarters (noun)	fanny (noun)
the part of an animal that corresponds to the human buttocks	the fleshy part of the human body that you sit on
the fleshy part of the human body that you sit on	external female sex organs