11
big(adjective, great, large, huge, vast)
11
extensive(adjective, large, huge, vast, immense)
10
cyclopean(adjective, big, giant)
10
humongous(adjective, great, big, large, size)
10
monster(noun, adjective, person, big, being)
10
whopping(adjective, slang, big, enormous)
9
leviathan(noun, adjective, person, big, size)
8
bulky(adjective, large, huge)
8
mighty(adjective, great, difficult, big, size)
8
mountainous(adjective, big, large, huge, hilly)
8
behemoth(noun, adjective, person, big, size)
7
towering(adjective, large, huge, vast, immense)
7
spacious(adjective, large)
7
voluminous(adjective, large)
6
walloping(adjective, informal, big)
6
capacious(adjective, large)
5
ample(adjective, large)
5
immeasurable(adjective, huge, vast, immense, copious)
5
colossus(noun, size, giant)
5
epic
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APASmart Define. (2016). mammoth thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/mammoth/thesaurus/synonyms
ChicagoSmart Define. 2016. "mammoth thesaurus" https://smartdefine.org/mammoth/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, mammoth thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/mammoth/thesaurus/synonyms>.
MLASmart Define. "mammoth thesaurus" 26 February 2016. Web. 23 September 2026. <https://smartdefine.org/mammoth/thesaurus/synonyms>