WordNet records no synonym and no antonym for hanseatic league. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a commercial and defensive confederation of free cities in northern Germany and surrounding areas; formed in 1241 and most influential in the 14th century when it included over 100 towns and functioned as an independent political power; the last official assembly was held in 1669
Synonyms, antonyms and the broader and narrower relations for hanseatic league come from Princeton University’s WordNet. Full sources and licences.