27 entries under noun topic. ×

14
cavern(hollow, concavity, cave, convex)
13
cave(hole, concavity, convex, small cave)
8
den(cave, small cave)
7
hollow(cave, small cave)
6
grot
5
hole
5
cove
4
crypt
3
antre
2
cavity
1
alcove(receptacle, concavity)
1
bower
1
arbor
1
conservatory
1
greenhouse
1
subterrane
1
chamber
1
crag
1
hermitage
1
summerhouse
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APASmart Define. (2015). grotto thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/grotto/thesaurus/synonyms
ChicagoSmart Define. 2015. "grotto thesaurus" https://smartdefine.org/grotto/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, grotto thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/grotto/thesaurus/synonyms>.
MLASmart Define. "grotto thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/grotto/thesaurus/synonyms>