oceanography vs oceanology

oceanography and oceanology both are nouns.

Word	Noun	Adjective	Verb	Adverb
oceanography	Yes	No	No	No
oceanology	Yes	No	No	No

As nouns, oceanography and oceanology are synonyms defined as:

oceanography and oceanology: the branch of science dealing with physical and biological aspects of the oceans

oceanography (noun)	oceanology (noun)
the branch of science dealing with physical and biological aspects of the oceans	the branch of science dealing with physical and biological aspects of the oceans