turnabout vs about-face

turnabout and about-face both are nouns.

Word	Noun	Adjective	Verb	Adverb
turnabout	Yes	No	No	No
about-face	Yes	No	Yes	No

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

Other hyponyms of turnabout include about turn, u-turn.

turnabout (noun)	about-face (noun)
turning in the opposite direction	a major change in attitude or principle or point of view
a decision to reverse an earlier decision	act of pivoting 180 degrees, especially in a military formation

turnabout (verb)	about-face (verb)
	change one's mind and assume the opposite viewpoint
	turn, usually 180 degrees