Plane
Plane adjective - Having a surface without bends, breaks, or irregularities.
Usage example: you can do these tracings on any plane surface
Smooth is a synonym for plane in level topic. In some cases you can use "Smooth" instead the word "Plane" as an adjective or a verb, when it comes to topics like activity, characteristic, property, action. popular alternative
Smooth
Smooth adjective - Having a surface without bends, breaks, or irregularities.
Usage example: a smooth skating rink
Plane is a synonym for smooth in even topic. You can use "Plane" instead the word "Smooth" as an adjective or a verb, if it concerns topics such as flatten, characteristic, action, level. popular alternative
Mutual synonyms
Both words in one sentence
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Averted once the Big Bad puts it under new management, turning it into a smooth flat plane of obsidian and frigid air.
Source: Fanfic / The Bridge - Landing, on the other hand, involves technical precision, which requires both knowledge of the numbers (principally airspeed and rate of descent) for the particular plane, and practice, since the numbers can quickly get out of hand without a smooth hand on the controls.
Source: Universal Driver's License
Cite this Source
Smooth and Plane. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/plane/smooth
Plane & Smooth. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/plane/smooth>.
Smooth or Plane. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/plane/smooth.
Google Ngram Viewer shows how "plane" and "smooth" have occurred on timeline