Yes, milk is a Scrabble word!

Verb

1. Take milk from female mammals

2. Exploit as much as possible

3. Add milk to

Noun

1. A white nutritious liquid secreted by mammals and used as food by human beings

2. Produced by mammary glands of female mammals for feeding their young

3. A river that rises in the Rockies in northwestern Montana and flows eastward to become a tributary of the Missouri River

4. Any of several nutritive milklike liquids