Gritted Substance Used for Smoothing Wood

Puzzle 7 of Groups of Three Easy Pack

Question is: Gritted Substance Used for Smoothing Wood

and the answer is: SANDPAPER

Word Meaning:

SANDPAPER — (uncountable) Strong paper coated with (traditionally) sand or (today) manufactured aluminum oxide, silicon carbide, or other abrasive material, used for smoothing and polishing.

Definitions from Wiktionary.

Gritted substance used for smoothing wood Groups of Three Answers | CodyCross Solutions