N.Y. is an abbreviation for New York, a synonym for which could be "The Empire State." Another synonym for N.Y. could be "The Big Apple," which is a nickname for the city of New York. Other synonyms could include "Gotham City," "The City That Never Sleeps," and "The Capital of the World." Additionally, if referring specifically to the city of New York, synonyms could be "Manhattan," "Brooklyn," "Queens," "Bronx," and "Staten Island." These synonyms all refer to different aspects of New York, from its nickname to specific neighborhoods within the city.