Age of Man vs Quaternary period

Age of Man and Quaternary period both are nouns.

Word	Noun	Adjective	Verb	Adverb
Age of Man	Yes	No	No	No
Quaternary period	Yes	No	No	No

As nouns, Age of Man and Quaternary period are synonyms defined as:

Age of Man and Quaternary period: the period of the last 2 million years

Other synonyms of Age of Man include Quaternary.

Age of Man (noun)	Quaternary period (noun)
the period of the last 2 million years	the period of the last 2 million years