Bird-footed dinosaur and Tyrannosaurus rex

Bird-footed dinosaur noun - Any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs.

Tyrannosaurus rex and bird-footed dinosaur are semantically related. In some cases you can replace phrase "Tyrannosaurus rex" with "Bird-footed dinosaur", this phrases are similar.

Tyrannosaurus rex noun - Large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America.

Bird-footed dinosaur and Tyrannosaurus rex are semantically related. You can use "Bird-footed dinosaur" instead a noun phrase "Tyrannosaurus rex".