Is canvas a noun

Yes, the Word canvas is both a noun and a verb.

The noun 'canvas' is a singular, common, concrete noun; a Word for a strong, coarse unbleached cloth made from hemp, flax, or cotton; a Word for a thing.

The verb to 'canvas' (canvases, canvasing, canvased) is to cover with canvas.

The homophone 'canvass' is also a noun and a verb.

The noun 'canvass' is a singular, common, abstract noun; a Word for a process of attempting to secure votes or ascertain opinions.

The verb to 'canvass' is to go through a district or go to individuals in order to solicit political support or to determine opinions or sentiments.