rioter vs mischief-maker

rioter and mischief-maker both are nouns.

Word	Noun	Adjective	Verb	Adverb
rioter	Yes	No	No	No
mischief-maker	Yes	No	No	No

As nouns, mischief-maker is a hypernym of rioter; that is, mischief-maker is a word with a broader meaning than rioter:

rioter: troublemaker who participates in a violent disturbance of the peace; someone who rises up against the constituted authority
mischief-maker: someone who deliberately stirs up trouble

Other hypernyms of rioter include bad hat, trouble maker, troublemaker, troubler.

rioter (noun)	mischief-maker (noun)
troublemaker who participates in a violent disturbance of the peace; someone who rises up against the constituted authority	someone who deliberately stirs up trouble