masturbation vs wank

masturbation and wank both are nouns.

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

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

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

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

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

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