straightness vs honestness

straightness and honestness both are nouns.

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

As nouns, honestness is a hypernym of straightness; that is, honestness is a word with a broader meaning than straightness:

Other hypernyms of straightness include honesty.

straightness (noun)	honestness (noun)
a sexual attraction to (or sexual relations with) persons of the opposite sex	the quality of being honest
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