heterosexuality vs straightness

heterosexuality and straightness both are nouns.

Word	Noun	Adjective	Verb	Adverb
heterosexuality	Yes	No	No	No
straightness	Yes	No	No	No

As nouns, heterosexuality and straightness are synonyms defined as:

heterosexuality and straightness: a sexual attraction to (or sexual relations with) persons of the opposite sex

Other synonyms of heterosexuality include heterosexualism.

heterosexuality (noun)	straightness (noun)
a sexual attraction to (or sexual relations with) persons of the opposite sex	a sexual attraction to (or sexual relations with) persons of the opposite sex
	freedom from crooks or curves or bends or angles
	(of hair) lack of a tendency to curl
	having honest intentions
	trueness of course toward a goal