IPA: /dɪˈfɛnsˌmæn/
KK: /dɪˈfɛnsˌmæn/
A player in a sport, especially hockey, who is responsible for defending their team's goal and preventing the opposing team from scoring.
The defenseman made a great play to block the shot from the opposing team.
Defenseman → It is formed from "defense" (from Old French *defense*, meaning protection or guarding) and "-man" (meaning a person who). A defenseman is a person who provides protection or guarding, particularly in sports like hockey.
Think of someone who provides 'protection' ('defense') on a team — that's what a defenseman does.
No commonly confused words.