marine archeology vs underwater archaeology

marine archeology and underwater archaeology both are nouns.

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

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

marine archeology and underwater archaeology: the archeology of underwater sites

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

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