firebrand vs instigant

firebrand and instigant both are nouns.

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

As nouns, firebrand and instigant are synonyms defined as:

Other synonyms of firebrand include inciter, instigator, provoker.

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