allosaur

As a noun allosaur

is any of several huge carnivorous dinosaurs, of the superfamily allosauroidea, from the late jurassic and early cretaceous periods.

As a proper noun allosaurus is

.

As an adjective cretaceous

is of or relating to chalk.

As a noun allosaur is

any of several huge carnivorous dinosaurs, of the superfamily allosauroidea, from the late jurassic and early cretaceous periods.

As an adjective Jurassic

is of or pertaining to the second period of the Mesozoic era, a time still dominated by dinosaurs.

As a proper noun Jurassic

is the period from 201.3±0.2 to 145 million years ago, after the Triassic and before the Cretaceous; the geologic systems of this period.

As a noun allosaur is

any of several huge carnivorous dinosaurs, of the superfamily Allosauroidea, from the late Jurassic and early Cretaceous periods.

As a proper noun allosauroidea

is .

As a noun allosaur is

any of several huge carnivorous dinosaurs, of the superfamily allosauroidea, from the late jurassic and early cretaceous periods.

As nouns the difference between dinosaur and allosaur

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 allosaur is any of several huge carnivorous dinosaurs, of the superfamily allosauroidea, from the late jurassic and early cretaceous periods.