deaf person vs someone

deaf person and someone both are nouns.

Word	Noun	Adjective	Verb	Adverb
deaf person	Yes	No	No	No
someone	Yes	No	No	No

As nouns, someone is a hypernym of deaf person; that is, someone is a word with a broader meaning than deaf person:

deaf person: a person with a severe auditory impairment
someone: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

Other hypernyms of deaf person include individual, mortal, person, somebody, soul.

deaf person (noun)	someone (noun)
a person with a severe auditory impairment	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential