heckler vs troublemaker

heckler and troublemaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
heckler	Yes	No	No	No
troublemaker	Yes	No	No	No

As nouns, troublemaker is a hypernym of heckler; that is, troublemaker is a word with a broader meaning than heckler:

heckler: someone who tries to embarrass you with gibes and questions and objections
troublemaker: someone who deliberately stirs up trouble

Other hypernyms of heckler include bad hat, mischief-maker, trouble maker, troubler.

heckler (noun)	troublemaker (noun)
someone who tries to embarrass you with gibes and questions and objections	someone who deliberately stirs up trouble