Paleolithic vs Palaeolithic

Paleolithic and Palaeolithic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Paleolithic	Yes	No	No	No
Palaeolithic	Yes	No	No	No

As nouns, Paleolithic and Palaeolithic are synonyms defined as:

Paleolithic and Palaeolithic: second part of the Stone Age beginning about 750,000 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC

Other synonyms of Paleolithic include Paleolithic Age.

Paleolithic (noun)	Palaeolithic (noun)
second part of the Stone Age beginning about 750,000 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC	second part of the Stone Age beginning about 750,000 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC