straight person vs heterosexual person

straight person and heterosexual person both are nouns.

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

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

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

Other synonyms of straight person include heterosexual, straight.

straight person (noun)	heterosexual person (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