palaeobiology vs fossilology

palaeobiology and fossilology both are nouns.

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

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

palaeobiology: 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 palaeobiology include biological science, biology, palaeontology, paleontology.

palaeobiology (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