8 entries under opening topic. ×

2
margin(time, period, authorization, interval)
1
gap(time, spot, period, authorization)
0
allowance(authorization, permission, go-ahead)
0
assart(authorization, permission, go-ahead)
0
defoliated area(expression, authorization, permission, go-ahead)
0
empty space(expression, authorization, permission, go-ahead)
0
expanse(time, period, authorization, interval)
0
open space(expression, authorization, permission, go-ahead)
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APASmart Define. (2015). headroom thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/headroom/thesaurus/synonyms
ChicagoSmart Define. 2015. "headroom thesaurus" https://smartdefine.org/headroom/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, headroom thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/headroom/thesaurus/synonyms>.
MLASmart Define. "headroom thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/headroom/thesaurus/synonyms>