cob

Concise Oxford English Dictionary © 2008 Oxford University Press:
cob1

▶noun

• 1 Brit. a round loaf of bread.

• 2 short for corncob.

• 3 (also cobnut) a hazelnut or filbert.

• 4 a powerfully built, short-legged horse.

• 5 a male swan.

• 6 Brit. a roundish lump of coal.

– origin ME (denoting a strong man or leader): of unknown origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
cob2

▶noun Brit. a mixture of compressed clay and straw used, especially formerly, for building walls.

– origin C17: of unknown origin.