In my opinion, the whole poem is quite ironic - although she is mentioning the exultation and the royal color of death, the poem itself begins with the narrator saying that she cannot breathe - that she doesn't want to die.
So, I would say that the ironic parts are:
Exultation is the going
Of an inland soul to sea, -
Past the houses, past the headlands,
Into deep eternity!
Do you mean synonyms to the word dark that are also nouns?
Charcoal and Raven
It is important bc if you have to split ur money lets say 70 percent with 3 ppl you will have to use a fraction and you would have to divide