disputant (n.)
- apologist
- arguer
- battler
- belligerent
- blade
- bravo
- brawler
- bully
- bullyboy
- casuist
- combatant
- competitor
- contender
- contestant
- controversialist
- debater
- defendant
- diehard
- dissident
- duelist
- enforcer
- fencer
- fighter
- gamecock
- gladiator
- goon
- gorilla
- hood
- hoodlum
- hooligan
- knight
- litigant
- logomachist
- militant
- naysayer
- negativist
- objector
- obstructionist
- opposer
- plaintiff
- plug-ugly
- polemic
- polemicist
- polemist
- protester
- quarreler
- resister
- rioter
- rival
- rough
- rowdy
- ruffian
- scrapper
- squabbler
- strong-armer
- struggler
- swashbuckler
- sword
- swordsman
- thug
- tilter
- tough
- wrangler
