Yes, dust is a Scrabble word!

Verb

1. Remove the dust from

2. Rub the dust over a surface so as to blur the outlines of a shape

3. Cover with a light dusting of a substance

4. Distribute loosely

Noun

1. Fine powdery material such as dry earth or pollen that can be blown about in the air

2. The remains of something that has been destroyed or broken up

3. Free microscopic particles of solid material