Quaternary period vs Age of Man

Quaternary period and Age of Man both are nouns.

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

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

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

Other synonyms of Quaternary period include Quaternary.

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