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Tuniss
I would say "Laputa" is original diction. 

Which word or phrase is an example of original diction from Gulliver’s Travels?

Laputa

Laputa was the scientific and extravagant flying island in Swift's Gulliver's Travels. The word is one of the several neologisms by the author which appear over the course of the Gulliver's journey.

Another example of original diction in the novel is:  Houyhnhnm, the horse race.