Search Result for "opposer": 
Wordnet 3.0

NOUN (1)

1. someone who offers opposition;
[syn: adversary, antagonist, opponent, opposer, resister]

The Collaborative International Dictionary of English v.0.48:

opposer \op*pos"er\ ([o^]p*p[=o]z"[~e]r), n. One who opposes; an opponent; an antagonist; an adversary. [1913 Webster]
WordNet (r) 3.0 (2006):

opposer n 1: someone who offers opposition [syn: adversary, antagonist, opponent, opposer, resister] [ant: agonist]
Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "opposer": adversary, antagonist, anti, bitter-ender, brawler, con, defendant, diehard, disputant, dissentient, dissident, intransigent, irreconcilable, last-ditcher, litigant, match, naysayer, negativist, noncooperator, objector, obstructionist, obstructive, oppositionist, oppugnant, plaintiff, protester, quarreler, resister, scrapper, wrangler