playact vs pantomime

playact is not a noun while pantomime is a noun.

Word	Noun	Adjective	Verb	Adverb
playact	No	No	Yes	No
pantomime	Yes	No	Yes	No

As verbs, pantomime is a hyponym of playact; that is, pantomime is a word with a more specific, narrower meaning than playact:

playact: perform on a stage or theater
pantomime: act out without words but with gestures and bodily movements only

Other hyponyms of playact include stooge, mime, ham, ham it up, overact, overplay, underact, underplay.

playact (noun)	pantomime (noun)
	a performance using gestures and body movements without words

playact (verb)	pantomime (verb)
perform on a stage or theater	act out without words but with gestures and bodily movements only