hypsilophodont

As nouns the difference between dinosaur and hypsilophodont

is that dinosaur is any of the creatures belonging to the clade dinosauria, especially those that existed during the triassic, jurassic and cretaceous periods and are now extinct while hypsilophodont is a member of the genus (taxlink) of small ornithopod herbivorous dinosaurs.

As an adjective herbivorous

is feeding chiefly on plants.

As a noun hypsilophodont is

a member of the genus (taxlink) of small ornithopod herbivorous dinosaurs.

As nouns the difference between ornithopod and hypsilophodont

is that ornithopod is a type of bipedal, herbivorous, bird-hipped dinosaur from the cretaceous period, found on all seven continents while hypsilophodont is a member of the genus (taxlink) of small ornithopod herbivorous dinosaurs.