perversion vs oral sex

perversion and oral sex both are nouns.

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

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

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

perversion (noun)	oral sex (noun)
the action of perverting something (turning it to a wrong use)	oral stimulation of the genitals
an aberrant sexual practice
a curve that reverses the direction of something