The central core of an ear of corn; a corncob.

A natural building material of clay, sand, straw, and water.

A round, crusty bread roll (UK regional).

A male swan.

A short, strong, compact horse.

Initialism: close of business; the end of the workday.

Acronym: chip on board; an IC or LED bonded directly to a PCB.

Initialism: contingency operating base (military).

Acronym: chief of boat; the senior enlisted sailor on a submarine.