Flat
Mutual synonyms
Both words in one sentence
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But save for some gentle post-glacial hills, Polish coast is as flat as Illinois, and all Polish mountains run along the southern border of the country, 400 miles away.
Cite this Source
Glacial and Flat. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/flat/glacial
Flat & Glacial. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/flat/glacial>.
Glacial or Flat. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/flat/glacial.
Google Ngram Viewer shows how "flat" and "glacial" have occurred on timeline