paleobiology vs palaeontology

paleobiology and palaeontology both are nouns.

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

As nouns, palaeontology is a hypernym of paleobiology; that is, palaeontology 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
palaeontology: the earth science that studies fossil organisms and related remains

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

paleobiology (noun)	palaeontology (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