HKW is an abbreviation for the German term "Haus der Kulturen der Welt" which means House of World Cultures. This institution is located in Berlin and hosts a wide range of cultural and artistic events, exhibitions, and festivals. There are a number of synonyms that can be used for HKW, including the Berliner Festspiele, which is a major cultural festival in Berlin, and the Gropius Bau, which is a famous exhibition and event space in the city. Additionally, the term cultural center or art space can also be used as synonyms for HKW, as it is primarily a venue for promoting cultural exchange and understanding between different countries and cultures.