Fish

The word fish has several senses:

• A cold-blooded water-dwelling vertebrate with gills, specifically "bony" fish of class Osteichthyes, "cartilaginous" fish of class Chondrichthyes, as well as various groups of "jawless" fish. Other aquatic animals like jellyfish and cuttlefish are not truly fish.
• The flesh of a fish (in the primary sense above) used for food. May also include the flesh of other water-dwelling animals such as mollusks or crustaceans (commonly called shellfish).
• (As a verb) To attempt to catch fish for the purpose of food or sport.