fanny vs genitalia

fanny and genitalia both are nouns.

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

As nouns, genitalia is a hypernym of fanny; that is, genitalia is a word with a broader meaning than fanny:

Other hypernyms of fanny include crotch, genital organ, genitals, private parts, privates.

fanny (noun)	genitalia (noun)
the fleshy part of the human body that you sit on	external sex organ
external female sex organs