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Cretaceous vs Pachycephalosaur - What's the difference?

cretaceous | pachycephalosaur |

As a proper noun Cretaceous

is the geologic period within the Mesozoic era that comprises lower and upper epochs from about 146 to 65 million years ago.

As an adjective cretaceous

is of or relating to chalk.

As a noun pachycephalosaur is

any of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period.

cretaceous

English

(wikipedia Cretaceous)

Proper noun

(en proper noun)
  • (geology) The geologic period within the Mesozoic era that comprises lower and upper epochs from about 146 to 65 million years ago
  • *
    • As with the Lejeuneaceae, this pattern of massive speciation appears to be correlated with the Cretaceous explosion of the angiosperms and the simultaneous creation of a host of new microenvironments, differing in humidity, light intensity, texture, etc.

    See also

    *

    pachycephalosaur

    English

    (wikipedia pachycephalosaur) (wikispecies)

    Noun

    (en noun)
  • Any of a group of herbivorous dinosaurs, of the genus Pachycephalosaurus from the late Cretaceous period