act vs set off

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

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

act (noun)	set off (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

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