IPA: /ˈsʌnˌbeɪðər/
KK: /ˈsʌnˌbeɪðər/
A person who lies in the sun to enjoy its warmth and often to get a tan.
The beach was full of sunbathers enjoying the warm weather.
Sunbather → It is formed from "sun" (from Old English "sunne", meaning the star that provides light and warmth) and "bather" (from "bath" which comes from Old English "baþ", meaning to wash or immerse in water). The word "sunbather" refers to a person who bathes in the sun, enjoying its warmth and light.
Think of someone enjoying the warmth of the 'sun' while 'bathing' — that's why a sunbather is someone who relaxes in the sun.