| prairie | |
| prairie-like(adjective, flat) | |
| precise(adjective, calm, smooth, flat, plain) | |
| proportionate(adjective, calm, smooth, flat, plain) | |
| quiet(adjective, soft, gentle, flat, level) | |
| recline(depression, horizontality) | |
| rectilineal | |
| rectilinear | |
| rhythmic(adjective, quiet, soft, gentle, flat) | |
| rippleless(adjective, quiet, soft, gentle, flat) | |
| ruler-straight | |
| same(adjective, calm, direct, smooth, right) | |
| sea level | |
| sea of grass(expression, idiom) | |
| serene(adjective, quiet, soft, gentle, flat) | |
| shaven(adjective, quiet, soft, gentle, flat) | |
| sheer(adjective, smooth, solid, level, true) | |
| shiny(adjective, quiet, soft, gentle, flat) | |
| shortest(adjective, direct, right, true, straight) | |
| sideways |
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| APA | Smart Define. (2015). horizontal thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/horizontal/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "horizontal thesaurus" https://smartdefine.org/horizontal/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, horizontal thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/horizontal/thesaurus/synonyms>. |
| MLA | Smart Define. "horizontal thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/horizontal/thesaurus/synonyms> |