Is asphalt a noun

Yes, the Word asphalt is a noun as well as a verb.

The noun asphalt is a common, concrete noun, mass (uncountable) noun; a Word for a substance.

The verb asphalt is to cover or pave with asphalt.

Example sentences:

Noun: The asphalt on our driveway is starting to crack.

Verb: Our road is closed today so the town can asphalt it.