50 entries under substantial topic. ×
| considerable(adjective, significant, large, excessive) | |
| large | |
| great(adjective, significant, high, large) | |
| big(significant, large, huge, immense) | |
| extensive(common, significant, large, huge) | |
| sizable(significant, large) | |
| sizeable(adjective, significant, large, excessive) | |
| super(significant, large) | |
| weighty(significant, large) | |
| ample(significant, large, huge, immense) | |
| reasonable(significant, large) | |
| renowned(significant, large) | |
| respectable(significant, large) | |
| super-duper(significant, large) | |
| abundant(significant, large) | |
| appreciable(significant, large) | |
| bountiful(significant, large) | |
| comfortable(significant, large) | |
| commodious(significant, large) | |
| consequential(significant, large) |
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| APA | Smart Define. (2015). astronomical thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/astronomical/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "astronomical thesaurus" https://smartdefine.org/astronomical/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, astronomical thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/astronomical/thesaurus/synonyms>. |
| MLA | Smart Define. "astronomical thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/astronomical/thesaurus/synonyms> |