Yes, milk is a Scrabble word!
...and is worth 10 points in Scrabble, and 12 points in Words with Friends
milk
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
What Scrabble words can I make with the letters in milk?
3 Letter Words
2 Letter Words