Synonyms of behemoth
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giantA giant is an imaginary person who is very big and strong, especially one mentioned in old stories.
• a Nordic saga of giants and monsters
leviathanA leviathan is something which is extremely large and difficult to control, and which you find rather frightening.
• It's a leviathan of a book.
• He said he'd hooked a real monster of a fish.
Thesaurus for behemoth from the Collins English Thesaurus