marine archaeology vs underwater archeology

marine archaeology and underwater archeology both are nouns.

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

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

marine archaeology and underwater archeology: the archeology of underwater sites

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

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