palaeobiology vs paleontology

palaeobiology and paleontology both are nouns.

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

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

Other hypernyms of palaeobiology include biological science, biology, fossilology, palaeontology.

palaeobiology (noun)	paleontology (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