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You didn't italize or mark the phrase, but I see one good candidate:
"The circus animal trainer" is in a way another name given to Mervin, a kind of "renaming" him: this is called an appositive phrase, so if this was the phrase appositive phrase is the answer! (also, I don't see the other phrases here).
Two-voice poetry is written for two people to perform. The poetry usually has two columns—one for each person who is reading the poem. Each person reading the poem reads the text in one of the columns.
im not sure if this helps, but here you go