cob 
(kŏb)
(kŏb)n.
1. A corncob: corn on the cob.
2. A male swan.
3. A thickset, stocky, short-legged horse.
4. A small lump or mass, as of coal.
5. A mixture of clay and straw used as a building material.
[Probably from obsolete cob, round object, head, testicle.]