verb
Hey is an interjection or an exclamation. Often followed by an exclamation mark! "Hey! They opened the cafeteria early today for breakfast."
The word opened is a verb. It is the past tense of the verb "open".
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
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.
The part of speech for "lecturer" is a noun.