"Will be growing" is a verb phrase. It makes the future progressive tense of grow.
The word moss is a noun. It is a selection of green plants growing on the ground.
The word growing is a verb. It is the present participle of the verb grow.
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.