Is light a noun or verb?

The Word 'light' is a noun (light, lights), a verb(light, lights, lighting, lighted or lit), and an adjective(light, lighter, lightest). Examples:

noun: The light in here is not very good, I'll turn on the light.

verb: It's time to light the grill, everyone is hungry.

adjective: We had a light lunch with some lightconversation.