masturbator vs tosser

masturbator and tosser both are nouns.

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

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

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

masturbator (noun)	tosser (noun)
a person who practices masturbation	someone who throws lightly (as with the palm upward)
	terms of abuse for a masturbator