perversion vs anal sex

perversion and anal sex both are nouns.

Word	Noun	Adjective	Verb	Adverb
perversion	Yes	No	No	No
anal sex	Yes	No	No	No

As nouns, anal sex is a hyponym of perversion; that is, anal sex is a word with a more specific, narrower meaning than perversion:

Other hyponyms of perversion include paraphilia, anal intercourse, buggery, sodomy, head, oral sex.

perversion (noun)	anal sex (noun)
the action of perverting something (turning it to a wrong use)	intercourse via the anus, committed by a man with a man or woman
an aberrant sexual practice
a curve that reverses the direction of something