| boundary(noun, territory, limit, edge, border) | |
| border(noun, territory, limit, edge, borderline) | |
| limit(noun, mark, limit, edge, border) | |
| borderland(noun, territory, edge, border, contiguity) | |
| line(noun, mark, stroke, border) | |
| margin | |
| borderline | |
| bound(noun, limit, edge, boundary) | |
| edge(noun, outline, border) | |
| marches(noun, limit) | |
| terminal(noun, adjective, limit) | |
| end | |
| hinterland(noun, border, backcountry) | |
| liminal | |
| backwoods(noun, adjective, limit) | |
| compass | |
| confine(noun, limit) | |
| pale(noun, limit) | |
| extremity(noun, limit, edge, border, borderline) | |
| bourn(noun, limit) |
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| APA | Smart Define. (2015). frontier thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/frontier/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "frontier thesaurus" https://smartdefine.org/frontier/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, frontier thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/frontier/thesaurus/synonyms>. |
| MLA | Smart Define. "frontier thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/frontier/thesaurus/synonyms> |