The noun 'smell'

[Unregistered]

Is 'smell' (as in 'the smell of grass) a concrete or abstract noun?

Thanks.

[Mister Micawber]

Nouns name people, places, and things. One class of nouns is concrete. You can experience this group of nouns with your five senses: you see them, hear them, smell them, taste them, and feel them.

Can you smell a smell, Guest?