firebrand vs troubler

firebrand and troubler both are nouns.

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

As nouns, troubler is a hypernym of firebrand; that is, troubler is a word with a broader meaning than firebrand:

Other hypernyms of firebrand include bad hat, mischief-maker, trouble maker, troublemaker.

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