act vs refrain

act and refrain both are nouns.

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

act (noun)	refrain (noun)
something that people do or cause to happen	the part of a song where a soloist is joined by a group of singers
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

act (verb)	refrain (verb)
behave in a certain manner; show a certain behavior; conduct or comport oneself	choose not to consume
pretend to have certain qualities or state of mind	resist doing something
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