protohistory vs archaeology

protohistory and archaeology both are nouns.

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

As nouns, archaeology is a hypernym of protohistory; that is, archaeology is a word with a broader meaning than protohistory:

protohistory: the study of humans prior to the invention of writing
archaeology: the branch of anthropology that studies prehistoric people and their cultures

Other hypernyms of protohistory include archeology.

protohistory (noun)	archaeology (noun)
the study of humans prior to the invention of writing	the branch of anthropology that studies prehistoric people and their cultures