contradicter means one who contradicts. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From contradict + -er.
noun
- One who contradicts.“c. 1699-1736, Jonathan Swift, Hints on Good Manners
arguers, perpetual contradicters, long talkers, those who are absent in company, interrupters, not listeners, loud laughers”