rethink vs turnaround

rethink and turnaround both are nouns.

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

As nouns, turnaround is a hypernym of rethink; that is, turnaround is a word with a broader meaning than rethink:

Other hypernyms of rethink include change of mind, flip-flop, reversal, turnabout.

rethink (noun)	turnaround (noun)
thinking again about a choice previously made	turning in the opposite direction
	act or process of unloading and loading and servicing a vessel or aircraft for a return trip
	an area sufficiently large for a vehicle to turn around
	a decision to reverse an earlier decision
	time need to prepare a vessel or ship for a return trip

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