Black hole
Black hole noun - Empty space.
Usage example: a psychopath who seemingly has a black hole where his heart should be
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Synonyms for Black hole
Hollow and black hole are semantically related. In some cases you can use "Hollow" instead a noun phrase "Black hole".
Hollow
Hollow noun - A sunken area forming a separate space.
Black hole and hollow are semantically related. Sometimes you can use "Black hole" instead a noun "Hollow".
Both terms in one sentence
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A black hole inside a hollow shell could work (this is used in The World is Round, a novel by physicist Tony Rothmann, though in this case the planet in question is much larger than Earth, and the scheme is used to keep the surface gravity down).
Source: Baby Planet
Cite this Source
Hollow and Black hole. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/black_hole/hollow
Black hole & Hollow. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/black_hole/hollow>.
Hollow or Black hole. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/black_hole/hollow.
Google Ngram Viewer shows how "black hole" and "hollow" have occurred on timeline