u-turn vs reversion

u-turn and reversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
u-turn	Yes	No	No	No
reversion	Yes	No	No	No

As nouns, reversion is a hypernym of u-turn; that is, reversion is a word with a broader meaning than u-turn:

Other hypernyms of u-turn include reversal, reverse, turnabout, turnaround.

u-turn (noun)	reversion (noun)
complete reversal of direction of travel	a failure to maintain a higher state
	turning in the opposite direction
	returning to a former state
	(genetics) a return to a normal phenotype (usually resulting from a second mutation)
	a reappearance of an earlier characteristic
	(law) an interest in an estate that reverts to the grantor (or his heirs) at the end of some period (e.g., the death of the grantee)