Such is a predicate adjective (also referred to more generally as a subject complement). It modifies Sorrow, which is the subject of this sentence. The order of this sentence is inverted from the typical English, which would be " Her sorrow is such." Therefore, sorrow in this case is an adjective because it modifies a noun.
adverb
what part of speech is beneath
i want to know what part of speech is camping
The part of speech is a adjective
Oppose is a verb.
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.