They all made a living by forcefully chomping their prey apart inside their megamouth. T. rex is the chomp champion, chompion, of the land animals. Brian Switek uses this playful portmanteau in his recent Smithsonian article, reporting on the newest results in modeling and estimating bite force of large animals and referring to T. rex as the world chompion . Congratulations!
Keywords: comparative anatomy, biomechanics, paleontology, evolution, biology, bite.
References and more to explore
 Jennifer Viegas: T. Rex Had The Toughest Bite. DiscoveryNews, Feb. 28, 2012 [news.discovery.com/animals/t-rex-bite-122802.html].
 BBC Nature: Tyrannosaurus rex bite measured [see a video: www.bbc.co.uk/nature/17197633]
 Brian Switek: The Tyrannosaurus Rex's Dangerous and Deadly Bite [www.smithsonianmag.com/science-nature/The-Tyrannosaurus-Rexs-Dangerous-and-Deadly-Bite-169806936.html].
 Brian Switek: World Chompion. Smithsonian magazine, October 2012, page 14.