unravel vs straighten out

unravel and straighten out both are verbs.

Word	Noun	Adjective	Verb	Adverb
unravel	No	No	Yes	No
straighten out	No	No	Yes	No

As verbs, straighten out is a hypernym of unravel; that is, straighten out is a word with a broader meaning than unravel:

Other hypernyms of unravel include disentangle, unsnarl.

unravel (verb)	straighten out (verb)
become undone	put (things or places) in order
become or cause to become undone by separating the fibers or threads of	settle or put right
disentangle	change for the better
	make free from confusion or ambiguity; make clear
	make straight
	extricate from entanglement