"who are compassionate" what accurately describes this phrase? verb phrase, noun phrase, adjectival clause, or adverbial clause?

The correct answer is adjectival clause.

An adjectival clause is a dependent clause that works to describe a noun in a sentence. It is usually made of a group of words instead of one word only. All the words work together to modify the noun or pronoun.

A dependent clause contains a subject and a verb but it's not a complete sentence and it can not stand alone.

Adjectival clauses begin with a relative pronoun that connects them to the word they describe. The relative pronouns are: that, where, then, who, which, why etc.

In the clause who are compassionate, the who is the relative pronoun. The clause refers and modifies the noun appearing before in the sentence.

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