underwater archaeology vs marine archeology

underwater archaeology and marine archeology both are nouns.

Word	Noun	Adjective	Verb	Adverb
underwater archaeology	Yes	No	No	No
marine archeology	Yes	No	No	No

As nouns, underwater archaeology and marine archeology are synonyms defined as:

underwater archaeology and marine archeology: the archeology of underwater sites

Other synonyms of underwater archaeology include marine archaeology, underwater archeology.

underwater archaeology (noun)	marine archeology (noun)
the archeology of underwater sites	the archeology of underwater sites