playact vs underplay

playact and underplay both are verbs.

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

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

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

playact (verb)	underplay (verb)
perform on a stage or theater	play a card lower than (a held high card)
	act (a role) with great restraint