Synonyms of 'behemoth'
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
A giant is an imaginary person who is very big and strong, especially one mentioned in old stories.
a Nordic saga of giants and monsters
A leviathan is something which is extremely large and difficult to control, and which you find rather frightening.
It's a leviathan of a book.
Thesaurus for behemoth from the Collins English Thesaurus
If you refer to something as a behemoth , you mean that it is extremely large, and often that it is unpleasant , inefficient , or difficult to manage .