reversion vs turnabout

reversion and turnabout both are nouns.

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

As nouns, reversion and turnabout are synonyms defined as:

Other synonyms of reversion include reversal, reverse, turnaround.

reversion (noun)	turnabout (noun)
a failure to maintain a higher state	turning in the opposite direction
turning in the opposite direction	a decision to reverse an earlier decision
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)