paleobiology vs fossilology

paleobiology and fossilology both are nouns.

Word	Noun	Adjective	Verb	Adverb
paleobiology	Yes	No	No	No
fossilology	Yes	No	No	No

As nouns, fossilology is a hypernym of paleobiology; that is, fossilology is a word with a broader meaning than paleobiology:

paleobiology: a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms
fossilology: the earth science that studies fossil organisms and related remains

Other hypernyms of paleobiology include biological science, biology, palaeontology, paleontology.

paleobiology (noun)	fossilology (noun)
a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms	the earth science that studies fossil organisms and related remains