hand job vs onanism

hand job and onanism both are nouns.

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

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

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

Other hypernyms of hand job include masturbation.

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	a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation