IPA: //ˌkaʊntərɪˈfɔːrmər//
KK: /ˈkaʊntərɪˌfɔrmər/
A person who opposes changes or reforms, often in a political or religious context, and supports a return to previous practices or beliefs.
The counterreformer argued against the new policies that aimed to modernize the education system.
Counterreformer → It is formed from "counter-" (meaning against) and "reformer" (from Latin "reformare", meaning to form again or reshape). The word describes someone who opposes reforms or seeks to restore previous conditions.
Think of someone acting 'against' ('counter-') changes or 'reshaping' ('reformare') — that's why a counterreformer is someone who opposes reforms.
No commonly confused words.