Is the word ''greeting'' a verb or noun?

The Word 'greeting' is the present participle, present tense of the verb 'to greet'. The present participle of the verb is also an adjective and a gerund, a verbal noun. Examples:

verb: The hostess was greeting guests while the host was pouring drinks.

adjective: The greeting committee must be ready at nine sharp.

noun: Their greeting was warm and welcoming.