refrain vs act

refrain and act both are nouns.

Word	Noun	Adjective	Verb	Adverb
refrain	Yes	No	Yes	No
act	Yes	No	Yes	No

refrain (noun)	act (noun)
the part of a song where a soloist is joined by a group of singers	something that people do or cause to happen
	a subdivision of a play or opera or ballet
	a legal document codifying the result of deliberations of a committee or society or legislative body
	a short performance that is part of a longer program
	a manifestation of insincerity

refrain (verb)	act (verb)
choose not to consume	behave in a certain manner; show a certain behavior; conduct or comport oneself
resist doing something	pretend to have certain qualities or state of mind
	discharge one's duties
	play a role or part
	perform on a stage or theater
	behave unnaturally or affectedly
	perform an action, or work out or perform (an action)
	have an effect or outcome; often the one desired or expected
	be suitable for theatrical performance