palaeobiology vs biology

palaeobiology and biology both are nouns.

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

As nouns, biology is a hypernym of palaeobiology; that is, biology 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
biology: the science that studies living organisms

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

palaeobiology (noun)	biology (noun)
a branch of paleontology that deals with the origin and growth and structure of fossil animals and plants as living organisms	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms