What is the difference between Antilles and Carribean?

The Caribbean islands, consisting of the Greater Antilles on the north and the Lesser Antilles on the south and east (including the Leeward Antilles), are part of the somewhat larger West Indies grouping, which also includes the Lucayan Archipelago

Where is Leeward Antilles?

It is located in the Caribbean Sea.
Leeward Islands, French Îles Sous-le-Vent, Spanish Islas de Sotavento, an arc of West Indian islands that constitute the most westerly and northerly of the Lesser Antilles, at the northeastern end of the Caribbean Sea, between latitudes 16° and 19° N and longitudes 61° and 65° W.