Polynesia

nouns

the islands in the eastern part of Oceania
Polynesia
is a part of
a large group of islands in the south Pacific including Melanesia and Micronesia and Polynesia (and sometimes Australasia and the Malay Archipelago)
Oceania, Oceanica
is a part of
islands of central and South Pacific (Indonesia and Melanesia and Micronesia and Polynesia)
Austronesia
is an instance of (narrower)
a group of many islands in a large body of water
archipelago