sub·world | \ ˈsəb-ˌwər(-ə)ld 
\
\variants:
or sub-world
plural subworlds or sub-worlds
Definition of subworld
: 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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Time Traveler for subworld
The first known use of subworld was in 1887
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