For years I thought in Apocalypse Now when Brando (Kurtz) is heard on the tape, that he said "Those na-bombs - I hate them, I do hate them" as some kind of abbreviation for napalm bomb. Turns out he was saying "nabobs".
There has never been such a thing as a ninja in Japan. They were created entirely by media, and while there were samurais and sensei, there were never actually ninjas in Japan.
Your clue for Nabob is a bit misleading. It does not refer to all Brits who got rich in India. It only refers to those who worked for the East India Company who got rich off of scams and corrupt dealings. Other than that, it is usually referring to a viceroy or governor. Additionally, Native Europeans used "nabob" to refer to those who returned from India after having made a fortune there. Source of my info, Wikipedia, the source Quizmaster is so fond of referencing.
Nabob is highly misleading. It seems like a derivative of the Urdu word Nawab which was used as a title by the Islamic emperors in India. Never heard Nabob being defined in this context. Please verify.
Nice quiz, however, "The Tale of Genji" is actually considered the world's first novel. Here is at least one source (though there are many): https://www.newyorker.com/magazine/2015/07/20/the-sensualist-books-buruma. Otherwise, this was an interesting quiz.
https://en.wikipedia.org/wiki/Ninja
First line of the Wikipedia article