cob

nouns

nut of any of several trees of the genus Corylus
cob, cobnut, filbert, hazelnut
stocky short-legged harness horse
cob
is a type of (narrower)
horse used for pulling vehicles
harness horse
white gull having a black back and wings
Larus marinus, black-backed gull, cob, great black-backed gull
adult male swan
cob
is a type of (narrower)
stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult
swan