heterosexual person vs straight person

heterosexual person and straight person both are nouns.

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

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

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

Other synonyms of heterosexual person include heterosexual, straight.

heterosexual person (noun)	straight 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