1) Adversary 2) Antagonist 3) Anti 4) Antichrist 5) Dueler 6) Duelist 7) Dueller 8) Duellist 9) Foe 10) Foeman 11) Luddite 12) Withstander 1) Adversary 2) Antagonist 3) Anti 4) Contender 5) Human 6) Individual 7) Mortal 8) One against 9) Opponent 10) Person 11) Resister 12) Somebody 13) Someone 14) Someone who offers opposition 15) Soul 
• (n.) One who opposes; an opponent; an antagonist; an adversary.
Op·pos'er noun One who opposes; an opponent; an antagonist; an adversary. 
(muscle) Type: Term Synonyms: opponens digiti minimi (muscle)(muscle) Type: Term Synonyms: opponens pollicis (muscle)