| flat(adjective, smooth, flat, informal, level) | |
| level(adjective, smooth, flat, even, horizontal) | |
| two-dimensional | |
| even(adjective, smooth, flat, horizontal) | |
| horizontal(adjective, flat, even, horizontal) | |
| flush(adjective, smooth, flat, even) | |
| plane(adjective, smooth, even) | |
| smooth(adjective, smooth, informal, even) | |
| tabular(adjective, flat) | |
| direct(adjective, even) | |
| equal(adjective, even) | |
| planate(adjective, even) | |
| alike(adjective, even) | |
| balanced(adjective, even) | |
| consistent(adjective, even) | |
| constant(adjective, even) | |
| continual(adjective, even) | |
| continuous(adjective, even) | |
| coplanar | |
| flattened |
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| APA | Smart Define. (2015). planar thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/planar/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "planar thesaurus" https://smartdefine.org/planar/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, planar thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/planar/thesaurus/synonyms>. |
| MLA | Smart Define. "planar thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/planar/thesaurus/synonyms> |