oceanology vs earth science

oceanology and earth science both are nouns.

Word	Noun	Adjective	Verb	Adverb
oceanology	Yes	No	No	No
earth science	Yes	No	No	No

As nouns, earth science is a hypernym of oceanology; that is, earth science is a word with a broader meaning than oceanology:

oceanology: the branch of science dealing with physical and biological aspects of the oceans
earth science: any of the sciences that deal with the earth or its parts

oceanology (noun)	earth science (noun)
the branch of science dealing with physical and biological aspects of the oceans	any of the sciences that deal with the earth or its parts