54 entries under noun topic. ×

4
barrier(border, borderline)
4
delimitation
4
march(territory, edge, border, borderline)
4
terminus(limit, edge, border, borderline)
4
verge(limit, edge, border, borderline)
3
circumscription
3
division
3
mark
3
mete
3
precinct
3
border line
3
boundary line
3
brink(area, limit, edge, border)
3
confines(border, borderline)
3
extreme(limit, edge, boundary)
3
front line
3
marchland(territory, edge, borderline)
3
outpost(border, station, borderline)
3
perimeter(border, borderline, verge, threshold)
3
periphery(border, borderline, verge, threshold)
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APASmart Define. (2015). frontier thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/frontier/thesaurus/synonyms
ChicagoSmart Define. 2015. "frontier thesaurus" https://smartdefine.org/frontier/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, frontier thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/frontier/thesaurus/synonyms>.
MLASmart Define. "frontier thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/frontier/thesaurus/synonyms>