泳 is built from the 氵 (water (left)) and 永 components.
It reads エイ like 永, as do 詠 — learn 永 once and the family's reading comes with it.
A common word using 泳 is 泳ぐ (およぐ), meaning “to swim”.
Don't confuse it with 永, 詠, 氷, and 水 — 氷 (ice) is 水 with a dot; 永 (eternal) has a dot and a top stroke
