masturbator vs wanker

masturbator and wanker both are nouns.

Word	Noun	Adjective	Verb	Adverb
masturbator	Yes	No	No	No
wanker	Yes	No	No	No

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

Other hyponyms of masturbator include frotteur, jerk-off, tosser.

masturbator (noun)	wanker (noun)
a person who practices masturbation	terms of abuse for a masturbator