3 entries under idiom topic. ×
| ocean of emptiness(noun, expression, universe) | |
| interplanetary space(noun, expression, universe) | |
| back of beyond |
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Outer_space on
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| APA | Smart Define. (2015). outer space thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/outer_space/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "outer space thesaurus" https://smartdefine.org/outer_space/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, outer space thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/outer_space/thesaurus/synonyms>. |
| MLA | Smart Define. "outer space thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/outer_space/thesaurus/synonyms> |