The city near Calais is Lille, which is a 5-letter word. Lille is the capital of the Hauts-de-France region in northern France and is located about 100 km from Calais. It is also the largest city in the region and is known for its cultural heritage and vibrant nightlife. The city is home to the Eurostar terminal, making it a popular destination for travelers. The Euro is a 4-letter word and is the official currency of the European Union.