straighten out vs improve

straighten out and improve both are verbs.

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

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

Other hypernyms of straighten out include ameliorate, amend, better, meliorate.

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

Other hypernyms of straighten out include ameliorate, better, meliorate.

straighten out (verb)	improve (verb)
put (things or places) in order	get better
settle or put right	to make better
change for the better
make free from confusion or ambiguity; make clear
make straight
extricate from entanglement