onanism vs wank

onanism and wank both are nouns.

Word	Noun	Adjective	Verb	Adverb
onanism	Yes	No	No	No
wank	Yes	No	Yes	No

As nouns, wank is a hyponym of onanism; that is, wank is a word with a more specific, narrower meaning than onanism:

onanism: manual stimulation of the genital organs (of yourself or another) for sexual pleasure
wank: slang for masturbation

Other hyponyms of onanism include self-abuse, self-stimulation, frottage, hand job, jacking off, jerking off.

onanism (noun)	wank (noun)
manual stimulation of the genital organs (of yourself or another) for sexual pleasure	slang for masturbation
a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation

onanism (verb)	wank (verb)
	get sexual gratification through self-stimulation