Rough
Rough adjective - Not having a level or smooth surface.
Usage example: a rough board can give you splinters
Vertical
Both words in one sentence
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Woodpeckers in real life have feet with their toes in a kind of X formation — two forwards (the 2nd and 3rd digits), and two backwards (1st and 4th digits), to allow for clinging to rough vertical surfaces like tree bark.
Source: Four-Fingered Hands
Cite this Source
Vertical and Rough. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/rough/vertical
Rough & Vertical. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/rough/vertical>.
Vertical or Rough. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/rough/vertical.
Google Ngram Viewer shows how "rough" and "vertical" have occurred on timeline