The crossword solution for the term 'St. Kitts and ___ (Caribbean nation)' is Nevis, which is a 5-letter word. St. Kitts and Nevis are two islands in the Caribbean Sea that form a single nation. The islands are located in the Leeward Islands chain of the Lesser Antilles and are separated by a shallow 3-kilometer channel known as The Narrows. St. Kitts and Nevis gained independence from the United Kingdom in 1983 and are now a federal two-island nation.