Well, first you start by making sense when you ask the question.
After that, you look in a book and realize "tyrannosaur" has been extinct for about 65,000,000 years, and you won't be "getting" it...
The English word 'tyrannosaur' means large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous...