protoanthropology vs protohistory

protoanthropology and protohistory both are nouns.

Word	Noun	Adjective	Verb	Adverb
protoanthropology	Yes	No	No	No
protohistory	Yes	No	No	No

As nouns, protoanthropology and protohistory are synonyms defined as:

protoanthropology and protohistory: the study of humans prior to the invention of writing

protoanthropology (noun)	protohistory (noun)
the study of humans prior to the invention of writing	the study of humans prior to the invention of writing