Bronze Age vs prehistory

Bronze Age and prehistory both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bronze Age	Yes	No	No	No
prehistory	Yes	No	No	No

Bronze Age (noun)	prehistory (noun)
(archeology) a period between the Stone and Iron Ages, characterized by the manufacture and use of bronze tools and weapons	the time during the development of human culture before the appearance of the written word