An island group is a collection of multiple islands that are geographically close to one another. Some possible synonyms for the term include archipelago, cay cluster, island chain, island cluster, and island array. Each word has its own nuances and connotations: for example, "archipelago" might connote a larger group of islands or a more diverse range of sizes and shapes, while "island chain" might evoke a more linear or sequential arrangement. Other potential synonyms could include island community, island constellation, or island system. Regardless of the specific terminology used, island groups are fascinating formations worth exploring and appreciating.