IPA: /ˈseɪlˌboʊtə/
KK: /ˈseɪlˌboʊtər/
A person who operates or navigates a sailboat.
The sailboater skillfully maneuvered the boat through the waves.
Sailboater → It is formed from "sail" (from Old English *sægl*, meaning a piece of fabric used to catch wind) and "boater" (from "boat" which comes from Old English *bāt*, meaning a small vessel for traveling on water, plus the suffix "-er" meaning a person who). The word "sailboater" refers to a person who operates or uses a sailboat.
Think of someone using a "sail" to catch the wind and move a "boat" — that's why a sailboater is a person who sails a boat.