about-face vs reversal

about-face and reversal both are nouns.

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

As nouns, about-face and reversal are synonyms defined as:

about-face and reversal: a major change in attitude or principle or point of view

Other synonyms of about-face include policy change, volte-face.

As nouns, reversal is a hypernym of about-face; that is, reversal is a word with a broader meaning than about-face:

Other hypernyms of about-face include reverse, reversion, turnabout, turnaround.

about-face (noun)	reversal (noun)
a major change in attitude or principle or point of view	a change from one state to the opposite state
act of pivoting 180 degrees, especially in a military formation	the act of reversing the order or place of
	turning in the opposite direction
	a major change in attitude or principle or point of view
	a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
	a decision to reverse an earlier decision
	turning in an opposite direction or position
	an unfortunate happening that hinders or impedes; something that is thwarting or frustrating

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