Whitehead

noun

1. A pimple formed by a clogged sebaceous gland, usually with a milky-white cap.

   "Ruth knew that the whiteheads of her teenage acne were a temporary state of affairs, but that did nothing to quell her distress when an eruption hit just before prom."

2. A species of passerine bird, endemic to New Zealand (Mohoua albicilla)
3. The blue-winged snow goose, Anser caerulescens caerulescens.
4. The surf scoter duck.
5. A domestic pigeon of a particular breed; a white-tailed monk.