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sea (EN)
noun, adjective

noun “sea”

singular sea, plural seas or uncountable
  1. a large body of saltwater smaller than an ocean, often connected to an ocean or another sea
    We spent our summer vacation sailing across the calm waters of the Aegean Sea.
  2. a metaphor for something immense or turbulent
    After the concert tickets went on sale, the crowd outside the venue quickly became a sea of eager fans.
  3. in astronomy or planetary science, a vast, flat area of basaltic rock on the moon or a planet
    The lunar rover traversed the vast expanse of the Sea of Serenity, its wheels kicking up dust on the moon's surface.

adjective “sea”

base form sea, non-gradable
  1. related to, located in, or characteristic of the sea
    The sea captain has spent more than thirty years navigating the ocean's treacherous waves.