Mesolithic Age vs Mesolithic

Mesolithic Age and Mesolithic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mesolithic Age	Yes	No	No	No
Mesolithic	Yes	No	No	No

As nouns, Mesolithic Age and Mesolithic are synonyms defined as:

Mesolithic Age and Mesolithic: middle part of the Stone Age beginning about 15,000 years ago

Other synonyms of Mesolithic Age include Epipaleolithic.

Mesolithic Age (noun)	Mesolithic (noun)
middle part of the Stone Age beginning about 15,000 years ago	middle part of the Stone Age beginning about 15,000 years ago