Border
Border noun - The line or relatively narrow space that marks the outer limit of something.
Usage example: a rug with a fancily embroidered border
Frontier is a synonym for border in boundary topic. In some cases you can use "Frontier" instead the word "Border" as a noun or an adjective, when it comes to topics like limit, bound, perimeter, edge. popular alternative
Frontier
Frontier noun - A region along the dividing line between two countries.
Usage example: the Apaches were once feared on both sides of the U.S.-Mexico frontier
Border is a synonym for frontier in boundary topic. You can use "Border" instead the word "Frontier" as a noun or an adjective, if it concerns topics such as position, limit, bound, perimeter. popular alternative
Nearby Word: frontiersman
Mutual synonyms
How words are described
Both words in one sentence
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Includes the North West Frontier, on the border with Afghanistan, an area which was beset with native uprisings and small wars right up until the British left.
- Reassigned to Antarctica: General Blackthorne's growing popularity and increasingly public criticisms over President Kimball's policies in the Mojave led to him and his supporters being exiled to the hostile border territories of the Frontier.
Source: Video Game / The Frontier -
We see the result of this in the side of Haffaton in the prequel story; they had conquered at least 50 cities, but other than a powerful border army expanding the frontier and some magical traps those cities are empty and they can't afford defenses even in the capital.
Source: Webcomic / Erfworld
Cite this Source
Frontier and Border. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/border/frontier
Border & Frontier. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/border/frontier>.
Frontier or Border. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/border/frontier.
Google Ngram Viewer shows how "border" and "frontier" have occurred on timeline