Permian vs Permian period

Permian and Permian period both are nouns.

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

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

Permian and Permian period: the period from 280 million to 230 million years ago; distinguished by reptiles

Permian (noun)	Permian period (noun)
the period from 280 million to 230 million years ago; distinguished by reptiles	the period from 280 million to 230 million years ago; distinguished by reptiles