14 entries under opening topic. ×

10
hole
6
porthole
5
keyhole
5
eyelet(noun, twist, circle, ring)
3
mousehole
3
peephole
3
pigeonhole
3
pinhole
1
fontanel
1
foramen
1
slot
0
perforation
0
puncture
0
transforation
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APASmart Define. (2015). loophole thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/loophole/thesaurus/synonyms
ChicagoSmart Define. 2015. "loophole thesaurus" https://smartdefine.org/loophole/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, loophole thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/loophole/thesaurus/synonyms>.
MLASmart Define. "loophole thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/loophole/thesaurus/synonyms>