underwater archaeology vs underwater archeology

underwater archaeology and underwater archeology both are nouns.

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

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

underwater archaeology and underwater archeology: the archeology of underwater sites

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

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