Yes, grain is a Scrabble word!

Verb

1. Thoroughly work in

2. Paint (a surface) to make it look like stone or wood

3. Form into grains

4. Become granular

Noun

1. A relatively small granular particle of a substance

2. Foodstuff prepared from the starchy grains of cereal grasses

3. The side of leather from which the hair has been removed

4. A weight unit used for pearls or diamonds: 50 mg or 1/4 carat

5. 1/60 dram; equals an avoirdupois grain or 64.799 milligrams

6. 1/7000 pound; equals a troy grain or 64.799 milligrams

7. Dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn

8. A cereal grass

9. The smallest possible unit of anything

10. The direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric

11. The physical composition of something (especially with respect to the size and shape of the small constituents of a substance)