pansexual vs someone

pansexual and someone both are nouns.

Word	Noun	Adjective	Verb	Adverb
pansexual	Yes	No	No	No
someone	Yes	No	No	No

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

pansexual: a person who participates in (or is open to) sexual activities of many kinds
someone: a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential

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

pansexual (noun)	someone (noun)
a person who participates in (or is open to) sexual activities of many kinds	a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential