booster Antonyms

insurgent paynim polemist preventer protester pyrrhonist questioner quibbler railer pagan obstructionist objector irreligionist knocker libertine litigant misanthropist misogamist nihilist nullifidian rapper reducer refuter detractor negativist resistor faultfinder dumper naysayer nitpicker belittler weakener vilifier underminer reviler sceptic scoffer skeptic slanderer sneerer traducer unbeliever contrarian adversary censurer challenger combatant contestant contradictory critic