Is snow a noun

Yes, the Word 'snow' is a verb and a noun.

The noun 'snow' is a Word for water vapor frozen into ice crystals that falls from the atmosphere in the form of flakes; a Word for quantities of these crystals that cover the ground or other objects; a Word for something resembling these crystals or quantities of these crystals; a Word for a thing.

Example uses:

The weather report said it will snow tonight. (verb)

We're required to keep the snow removed from the sidewalk. (noun)