Horned dinosaur and Ornithischian dinosaur

Horned dinosaur noun - Any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia.

Ornithischian dinosaur and horned dinosaur are semantically related. In some cases you can use "Ornithischian dinosaur" instead a noun phrase "Horned dinosaur".

Ornithischian dinosaur noun - Herbivorous dinosaur with a pelvis like that of a bird.

Horned dinosaur and ornithischian dinosaur are semantically related. Sometimes you can replace phrase "Horned dinosaur" with "Ornithischian dinosaur", this phrases are similar.