Nabob is a noun that refers to a person of great wealth.

Coming from Urdu, our word of the day was originally used to refer to a high-ranking official of the Mogul empire. After being imported into English, it came to refer more generally to anyone with great wealth. Example:

All those nabobs in their expensive suits may not be the most enjoyable guys to wait on. But it’s worth putting up with their snobbery because most of them are great tippers