straightness vs heterosexuality

straightness and heterosexuality both are nouns.

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

As nouns, straightness and heterosexuality are synonyms defined as:

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

Other synonyms of straightness include heterosexualism.

straightness (noun)	heterosexuality (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