| stable(adjective, calm, quiet, direct, smooth) | |
| stage(noun, point, level, quantity, amount) | |
| standard(noun, point, level, quantity, amount) | |
| step | |
| straighten(verb, smooth, crush, level, smash) | |
| stretch(noun, top, level, face, side) | |
| swim(verb, ascent) | |
| tranquil(adjective, quiet, soft, gentle, flat) | |
| tree | |
| unvarying(adjective, quiet, smooth, right, soft) | |
| unwrinkled(adjective, smoothness) | |
| velvety(adjective, quiet, soft, gentle, flat) | |
| wedge(noun, instrument, tool) | |
| zone(noun, extent, stage, echelon) | |
| abrade(verb, smooth, crush, level, smash) | |
| acreage(noun, extent) | |
| adjacent | |
| aerofoil | |
| air transport | |
| airbus(noun, aircraft) |
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| APA | Smart Define. (2015). plane thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/plane/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "plane thesaurus" https://smartdefine.org/plane/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, plane thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/plane/thesaurus/synonyms>. |
| MLA | Smart Define. "plane thesaurus" 24 October 2015. Web. 23 September 2026. <https://smartdefine.org/plane/thesaurus/synonyms> |