Age of Fishes vs Devonian period

Age of Fishes and Devonian period both are nouns.

Word	Noun	Adjective	Verb	Adverb
Age of Fishes	Yes	No	No	No
Devonian period	Yes	No	No	No

As nouns, Age of Fishes and Devonian period are synonyms defined as:

Age of Fishes and Devonian period: the period from 405 million to 345 million years ago; characterized by preponderance of fishes and appearance of amphibians and ammonites

Other synonyms of Age of Fishes include Devonian.

Age of Fishes (noun)	Devonian period (noun)
the period from 405 million to 345 million years ago; characterized by preponderance of fishes and appearance of amphibians and ammonites	the period from 405 million to 345 million years ago; characterized by preponderance of fishes and appearance of amphibians and ammonites