Phanerozoic aeon vs Phanerozoic

Phanerozoic aeon and Phanerozoic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Phanerozoic aeon	Yes	No	No	No
Phanerozoic	Yes	No	No	No

As nouns, Phanerozoic aeon and Phanerozoic are synonyms defined as:

Phanerozoic aeon and Phanerozoic: the period from about 540 million years ago until the present, a period when abundant life existed

Other synonyms of Phanerozoic aeon include Phanerozoic eon.

Phanerozoic aeon (noun)	Phanerozoic (noun)
the period from about 540 million years ago until the present, a period when abundant life existed	the period from about 540 million years ago until the present, a period when abundant life existed