quarreller vs controversialist

quarreller and controversialist both are nouns.

Word	Noun	Adjective	Verb	Adverb
quarreller	Yes	No	No	No
controversialist	Yes	No	No	No

As nouns, controversialist is a hypernym of quarreller; that is, controversialist is a word with a broader meaning than quarreller:

quarreller: a disputant who quarrels
controversialist: a person who disputes; who is good at or enjoys controversy

Other hypernyms of quarreller include disputant, eristic.

quarreller (noun)	controversialist (noun)
a disputant who quarrels	a person who disputes; who is good at or enjoys controversy