Is sweeping a noun or a verb?

The Word "sweeping" is a verb, the present participle, present tense of the verb to sweep; which can be used either as an adjective or a gerund, a verbal noun. Examples:

Verb: Linda was busily sweeping the front porch when I arrived.

Adjective: His election produced sweeping changes in government policy.

Noun: Sweeping is easier and more effective if your broom is in good condition.