subworld
noun
sub·world
ˈsəb-ˌwər(-ə)ld
variants
or sub-world
plural subworlds or sub-worlds
: a world that is part of a larger world
This season, the show created a whole new subworld within its already intricate and immersive world by taking things under the sea.—Kayla Kumari Upadhyaya
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Merriam-Webster unabridged
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