straight person vs heterosexual

straight person and heterosexual both are nouns.

Word	Noun	Adjective	Verb	Adverb
straight person	Yes	No	No	No
heterosexual	Yes	Yes	No	No

As nouns, straight person and heterosexual are synonyms defined as:

straight person and heterosexual: a person having a sexual orientation to persons of the opposite sex

Other synonyms of straight person include heterosexual person, straight.

straight person (noun)	heterosexual (noun)
a person having a sexual orientation to persons of the opposite sex	a person having a sexual orientation to persons of the opposite sex

straight person (adjective)	heterosexual (adjective)
	sexually attracted to members of the opposite sex