The crossword solution for the term 'Is Spanish?' is 'ESTA', which is a four-letter word. ESTA stands for Electronic System for Travel Authorization, which is an online system that determines the eligibility of visitors to travel to the United States. It is administered by the Department of Homeland Security and is used to determine if a person is eligible to enter the United States under the Visa Waiver Program. ESTA is also used to determine if a person is eligible to travel to the United States as a tourist or business traveler.