onanism vs hand job

onanism and hand job both are nouns.

Word	Noun	Adjective	Verb	Adverb
onanism	Yes	No	No	No
hand job	Yes	No	No	No

As nouns, hand job is a hyponym of onanism; that is, hand job 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
hand job: slang for masturbation

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

onanism (noun)	hand job (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a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation