4
shellproof
3
bomb shelter(noun, expression, idiom)
2
impervious
2
watertight
1
air-raid shelter
1
airtight
1
bunker
1
cave
1
concealment
1
cover
1
covert
1
dugout
1
earth
1
fallout shelter
1
fireproof
1
flameproof
1
foolproof
1
foxhole
1
hermetic
1
impregnable
<123>
11 years ago|609 views|share |citing 
APASmart Define. (2015). bombproof thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/bombproof/thesaurus/synonyms
ChicagoSmart Define. 2015. "bombproof thesaurus" https://smartdefine.org/bombproof/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, bombproof thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/bombproof/thesaurus/synonyms>.
MLASmart Define. "bombproof thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/bombproof/thesaurus/synonyms>