trouble maker vs troubler

trouble maker and troubler both are nouns.

Word	Noun	Adjective	Verb	Adverb
trouble maker	Yes	No	No	No
troubler	Yes	No	No	No

As nouns, trouble maker and troubler are synonyms defined as:

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

trouble maker (noun)	troubler (noun)
someone who deliberately stirs up trouble	someone who deliberately stirs up trouble