frottage vs onanism

frottage and onanism both are nouns.

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

As nouns, onanism is a hypernym of frottage; that is, onanism is a word with a broader meaning than frottage:

frottage: masturbation by rubbing against another person (as in a crowd)
onanism: manual stimulation of the genital organs (of yourself or another) for sexual pleasure

Other hypernyms of frottage include masturbation.

frottage (noun)	onanism (noun)
masturbation by rubbing against another person (as in a crowd)	manual stimulation of the genital organs (of yourself or another) for sexual pleasure
	a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation