Synonyms|188Antonyms|2|Broader|9Narrower|3Related|211
18
stone
10
granite
9
rock
8
adamant
7
brick
6
iron
4
bone
4
cement
4
concrete
3
crystal(noun, hardness)
3
marble
3
quartz(noun, hardness)
2
firestone
2
heart of oak(expression, idiom, hardness)
2
flintstones
2
steel
1
pebble
1
Flint River(noun, expression, idiom)
1
crag(noun, hardness)
1
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APASmart Define. (2015). flint thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/flint/thesaurus/synonyms
ChicagoSmart Define. 2015. "flint thesaurus" https://smartdefine.org/flint/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, flint thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/flint/thesaurus/synonyms>.
MLASmart Define. "flint thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/flint/thesaurus/synonyms>