Answer:
Simile: “but the land of gold seemed to hold him like a spell”
Metaphor: speaker says a promise made is a debt unpaid. Here, the poet uses a metaphor. He compares a promise to unpaid debt.
Personification: It seemed to the speaker as if the furnace roared
Repetition: Now Sam McGee was from Tennessee, where the cotton blooms and blows. Why he left his home is the south to roam 'round the Pole, God only knows.
End rhyme: *see repetition
Imagery: I cremated Sam McGee
Hyperbole: The line, “But the queerest they ever did see,” contains hyperbole.
Assonance: Howled out their woes to the homeless snows— O God! how I loathed the thing
Consonance: Since I left Plumtree, down in Tennessee, it’s the first time I’ve been warm
Internal rhyme: The Northern Lights have seen queer sights”. The words “lights” and “sights” rhyme with each other.
I could not find an understatement in the poem, sorry.