IPA: /ˈkaʊntərˌpʌnʧər/
KK: /ˈkaʊntərˌpʌnʧər/
A person, especially in sports like boxing or tennis, who responds to an opponent's moves or attacks with their own counterattacks, often waiting for the opponent to make a mistake.
The counterpuncher waited patiently for his opponent to make a move before striking back.
Counterpuncher → It is formed from "counter-" (meaning against) and "punch" (from Old French *ponchier*, meaning to strike or hit) and the suffix "-er" (meaning a person who). A counterpuncher is a person who strikes back against an opponent's attack.
Think of someone who strikes 'against' ('counter-') an opponent's 'hit' ('punch') — that's why a counterpuncher is someone who responds with a punch.
No commonly confused words.