palaeozoology vs paleobiology

palaeozoology and paleobiology both are nouns.

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

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

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

Other hypernyms of palaeozoology include palaeobiology, zoological science, zoology.

palaeozoology (noun)	paleobiology (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