Collocations for grain - noun

large, small
whole
The journal reports that eating whole grains protects against diabetes.

cereal, rice, wheat, etc.
pollen

grow, produce
store

harvest, production, yield
crop
exports, imports
elevator (= a building used for storing grain)

fine, smooth
coarse
natural
This wood has a beautiful natural grain.

wood

across the grain, against the grain
along the grain, with the grain
Cut the wood along the grain.