paleozoology vs palaeobiology

paleozoology and palaeobiology both are nouns.

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

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

paleozoology: the study of fossil animals
palaeobiology: a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms

Other hypernyms of paleozoology include paleobiology, zoological science, zoology.

paleozoology (noun)	palaeobiology (noun)
the study of fossil animals	a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms