future pronoun and verb
"They" is a pronoun. "Will" can be a verb or a noun. As a noun, "will" can mean a) a document stating to whom one's possessions will be inherited after the person's death, or b) a wish or intent. As a verb, it can be a helping/auxillery verb. You'll probably find a better answer by Google searching [define will].
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "breezy" is an adjective.
The part of speech for "buried" is a verb.
The part of speech for "indefinite" is an adjective.