Jurassic period vs Jurassic

Jurassic period and Jurassic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jurassic period	Yes	No	No	No
Jurassic	Yes	Yes	No	No

As nouns, Jurassic period and Jurassic are synonyms defined as:

Jurassic period and Jurassic: the period from 190 million to 135 million years ago, distinguished by dinosaurs and conifers

Jurassic period (noun)	Jurassic (noun)
the period from 190 million to 135 million years ago, distinguished by dinosaurs and conifers	the period from 190 million to 135 million years ago, distinguished by dinosaurs and conifers

Jurassic period (adjective)	Jurassic (adjective)
	of or relating to or denoting the second period of the Mesozoic era