cobnut

1. the central cylindrical woody part of the maize ear to which the grains are attached.
2. a round loaf of bread.

   a round granary cob

3. a hazelnut or filbert.

   cobnut stuffing

4. a powerfully built, short-legged horse.

   he's got a nice young bay cob if you want to hack

5. a male swan.

   ganders and cobs have permanent pair bonds

6. a roundish lump of coal.

late Middle English (denoting a strong man or leader): of unknown origin. The underlying general sense appears to be ‘rounded, sturdy’.