booster Antonyms

irreligionist paynim polemist preventer protester pyrrhonist questioner quibbler railer pagan obstructionist objector knocker libertine litigant misanthropist misogamist misogynist 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 insurgent adversary censurer challenger combatant contestant contradictory