Pennsylvanian vs Pennsylvanian period

Pennsylvanian and Pennsylvanian period both are nouns.

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

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

Pennsylvanian and Pennsylvanian period: the period from 310 million to 280 million years ago; characterized by warm climate and swampy land

Other synonyms of Pennsylvanian include Upper Carboniferous, Upper Carboniferous period.

Pennsylvanian (noun)	Pennsylvanian period (noun)
a native or resident of Pennsylvania	the period from 310 million to 280 million years ago; characterized by warm climate and swampy land
the period from 310 million to 280 million years ago; characterized by warm climate and swampy land