海溝 (かいこう)ocean trench; deep

ocean trench; deepnoun (common) (futsuumeishi), adjectival nouns or quasi-adjectives (keiyodoshi)

海溝, its kanji, and other words that share them.Open this graph

Kanji in 海溝

北海道ほっかいどうHokkaido (island, prefectural-level administrative unit)
海外かいがいforeign; abroad
東海とうかいregion south of Tokyo on Pacific Ocean side of Japan; eastern sea
海うみsea; ocean
海上かいじょうon the sea; surface of the sea
海軍かいぐんnavy
海岸かいがんcoast; beach
海洋かいようocean
溝みぞditch; drain
側溝そっこうgutter; ditch
排水溝はいすいこうdrainage; gutter
にげ溝にげみぞclearance groove; under cut
キー溝キーみぞkeyway
マリアナ海溝マリアナかいこうMariana Trench (deepest part of the ocean, near the Mariana Islands)
レコードの溝レコードのみぞrecord groove
上溝桜うわみずざくらJapanese bird cherry (Prunus grayana); Gray's bird cherry

See how 海溝 connects to the rest of Japanese.