set off vs act

set off is not a noun while act is a noun.

Word	Noun	Adjective	Verb	Adverb
set off	No	No	Yes	No
act	Yes	No	Yes	No

set off (noun)	act (noun)
	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

set off (verb)	act (verb)
cause to burst with a violent release of energy	behave in a certain manner; show a certain behavior; conduct or comport oneself
set in motion or cause to begin	pretend to have certain qualities or state of mind
direct attention to, as if by means of contrast	discharge one's duties
provoke or stir up	play a role or part
put in motion or move to act	perform on a stage or theater
depart for someplace	behave unnaturally or affectedly
make up for	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