5
marginal(adjective, edge)
5
peripheral(adjective, edge)
5
rimming(adjective, edge)
5
termination(noun, top, limit, extreme, edge)
5
wall
4
acme(noun, limit, edge)
4
apex(noun, limit, edge)
4
border line(noun, expression, idiom)
4
circuit(noun, area, limit, scope, range)
4
curb(noun, verb, edge)
4
enclosure(noun, area, limit, scope, division)
4
line of demarcation(noun, expression, idiom, limit, border)
4
marches(noun, limit)
4
maximum(noun, limit, edge)
4
sharpness(noun, edge)
4
zenith(noun, limit, edge)
3
boundaries
3
ceiling
3
coast(noun, edge)
3
crease
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APASmart Define. (2015). boundary thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/boundary/thesaurus/synonyms
ChicagoSmart Define. 2015. "boundary thesaurus" https://smartdefine.org/boundary/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, boundary thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/boundary/thesaurus/synonyms>.
MLASmart Define. "boundary thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/boundary/thesaurus/synonyms>