Sea
Sea noun - The whole body of salt water that covers nearly three-fourths of the earth.
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Synonyms for Sea
Underwater and sea are semantically related. In some cases you can use "Underwater" instead an adjective "Sea".
Underwater
Underwater adjective - Living, lying, or occurring below the surface of the water.
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Synonyms for Underwater
Sea and underwater are semantically related. Sometimes you can use "Sea" instead an adjective "Underwater".
Both words in one sentence
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BIONICLE's Mahri Nui arc took place in an underwater setting, complete with Fish People, underwater vehicles and robots, a sunken city, Eldritch Abomination-like sea monsters, and vampiric squid.
Source: Ocean Punk -
Most sea stories focus on the crew of specific ship or set of ships, though some stories also depict stationary sea platforms or underwater bases.
Source: Sea Stories - Granted. They live underwater and littering makes underwater unhealthy for sea creatures to live in.
Cite this Source
Underwater and Sea. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/sea/underwater
Sea & Underwater. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/sea/underwater>.
Underwater or Sea. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/sea/underwater.
Google Ngram Viewer shows how "sea" and "underwater" have occurred on timeline