
1) Accusatorial 2) Accuser 3) Arguer 4) Caviler 5) Caviller 6) Combatant 7) Contester 8) Crusader 9) Debater 10) Disputant 11) Eristic 12) Hairsplitter 13) Logomach 14) Logomachist 15) Meliorist 16) Obstructer 17) Obstructionist 18) Obstructor 19) Quarreler 20) Quarreller 21) Quibbler 22) Reformer 23) Resister
Found on
https://www.crosswordclues.com/clue/controversialist

• (n.) One who carries on a controversy; a disputant.
Found on
http://thinkexist.com/dictionary/meaning/controversialist/
Con`tro·ver'sial·ist noun One who carries on a controversy; a disputant. « He [ Johnson] was both intellectually and morally of the stuff of which
controversialists are made.
Macaulay. »
Found on
http://www.encyclo.co.uk/webster/C/151
No exact match found.