hand job vs masturbation

hand job and masturbation both are nouns.

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

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

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

Other hypernyms of hand job include onanism.

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