prehistory vs prehistoric culture

prehistory and prehistoric culture both are nouns.

Word	Noun	Adjective	Verb	Adverb
prehistory	Yes	No	No	No
prehistoric culture	Yes	No	No	No

As nouns, prehistory and prehistoric culture are synonyms defined as:

prehistory and prehistoric culture: the time during the development of human culture before the appearance of the written word

prehistory (noun)	prehistoric culture (noun)
the time during the development of human culture before the appearance of the written word	the time during the development of human culture before the appearance of the written word