溝 is built from the 氵 (water (left)) and 冓 (framework (in 構·講)) components.
It belongs to a phonetic family with 構, 講, and 購 — they share the 冓 component and the reading コウ.
A common word using 溝 is 溝 (どぶ), meaning “ditch, drain, gap”.
Don't confuse it with 講, 構, and 購.
