turnabout vs rethink

turnabout and rethink both are nouns.

Word	Noun	Adjective	Verb	Adverb
turnabout	Yes	No	No	No
rethink	Yes	No	Yes	No

As nouns, rethink is a hyponym of turnabout; that is, rethink is a word with a more specific, narrower meaning than turnabout:

Other hyponyms of turnabout include afterthought, reconsideration, second thought.

turnabout (noun)	rethink (noun)
turning in the opposite direction	thinking again about a choice previously made
a decision to reverse an earlier decision

turnabout (verb)	rethink (verb)
	change one's mind