"To several" is a preposition phrase, with "several" functioning as an adjective modifying a noun.
Since it modifies "shovel" it is an adjective.
Noun--however, many words have several possible parts of speech; please submit the Whole Sentence when asking for part of speech--cannot be sure without seeing how it is used in the sentence, as that's what determines the part of speech.
Severely is an adverb.
They could be used as several different parts of speech. Typically the entire phrase acts as one part of speech... a noun phrase, a verb phrase, etc.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is beneath
The part of speech for "answer" is a noun.
Severe is an adjective.
Verb