directness vs straightness

directness and straightness both are nouns.

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

As nouns, directness and straightness are synonyms defined as:

directness (noun)	straightness (noun)
trueness of course toward a goal	a sexual attraction to (or sexual relations with) persons of the opposite sex
the quality of being honest and straightforward in attitude and speech	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