IPA: /ˈkɒntrəˌvɜːrtər/
KK: /kɒntrəˈvɜːrtər/
A person who argues against or disagrees with something, often in a formal or public way.
The controverter presented strong arguments during the debate.
Controverter → It is formed from "contra-" (meaning against) and "vertere" (meaning to turn). The word describes someone who turns against or opposes a particular idea or argument.
Think of someone who 'turns against' ('contra-') an argument or idea — that's what a controverter does.