The word waiting is a verb. It is the present participle of the verb to wait.
"to wait" is an infinitive. It's created with to and the base form of a verb, in this case, wait. "to" is known as an infinitive marker.
The word wait is a verb (wait, waits, waiting, waited), but wait is also a noun. Example sentence: The wait at the doctor's office was very long.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
Stand is a verb. It describes an action. "Stand on the curb and wait for the bus." Stand is also a noun. "Take a stand for what you believe in."
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.