coot

/kuːt/
noun
  1. A dark gray or black water bird with a white beak and forehead, found in lakes and marshes.
    • We spotted a family of coots building a nest among the reeds at the edge of the lake.
    • The coot's white beak stood out against its dark feathers as it swam near the dock.
    • A coot paddled quietly across the pond, dipping its head underwater for food.
  2. An informal term for an old person, especially one who is slightly eccentric or foolish.
    • My grandpa is a lovable old coot who always has a joke ready.
    • The old coot next door still mows his lawn in a suit and tie every Saturday.
    • Don't mind that crazy coot; he's been telling the same stories for fifty years.
Synonyms
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