IPA: /ˈhɛdseɪl/
KK: /ˈhɛdˌseɪl/
A type of sail that is located at the front of a sailing boat, usually in front of the main mast.
The sailor adjusted the headsail to catch the wind more effectively.
Headsail → The word is formed from "head" (from Old English "heafod", meaning the top or front) and "sail" (from Old English "segel", meaning a piece of fabric used to catch wind). A headsail is a sail set at the front of a ship, hence it is associated with the 'head' or front of the vessel.
Think of the 'top' or 'front' ('head') of a ship where the 'sail' is located — that's why a headsail is the sail at the front.
No commonly confused words.