Did you mean to say Antonyms ? If so , synonyms are words that are related and/ similar to a specific vocabulary word basically meaning the same thing. Antonyms on the other hand , mean the complete opposite of the vocabulary word given .
The answer is all of these.
The Duke is the speaker of the poem where he is entertaining an emissary who has come to negotiate the Duke's marriage. As he shows the visitor through his palace, they came across the portrait of the late Duchess. The Duke then began to reminisce about the portrait sessions and then about the Duchess herself. As his monologue continues, the reader realizes that it was the Duke who caused the untimely demise of the previous Duchess.
The denouement in the plot of a fictional work is the final resolution of all problems that occur within a novel or a play. It is the end result, something that happens when all conflicts are resolved.
Personally I believe the extended metaphor could be more effective since it provides more info and meaning to the poem itself
