instigant vs firebrand

instigant and firebrand both are nouns.

Word	Noun	Adjective	Verb	Adverb
instigant	Yes	No	No	No
firebrand	Yes	No	No	No

As nouns, instigant and firebrand are synonyms defined as:

Other synonyms of instigant include inciter, instigator, provoker.

instigant (noun)	firebrand (noun)
someone who deliberately foments trouble	someone who deliberately foments trouble
	a piece of wood that has been burned or is burning