An appositive is a noun or noun phrase that renames another noun right beside it. The appositive can be a short or long combination of words. Look at these appositive examples, all of which rename insect: The insect, a cockroach, is crawling across the kitchen table.
An adjective phrase is a group of words that describe a noun or pronoun in a sentence. The adjective phrase can be placed before, or after, the noun or pronoun in the sentence.
In linguistics, an adverbial phrase is a group of two or more words operating adverbially, meaning that their syntactic function is to modify a verb, an adjective, or an adverb. Adverbial phrases ("AdvP" in syntactic trees) are phrases that do the work of an adverb in a sentence.
I think it is an appositive phrase, but it has been a long time since I've done this.
