craniology vs life science

craniology and life science both are nouns.

Word	Noun	Adjective	Verb	Adverb
craniology	Yes	No	No	No
life science	Yes	No	No	No

As nouns, life science is a hypernym of craniology; that is, life science is a word with a broader meaning than craniology:

craniology: the scientific study of the skulls of various human races
life science: any of the branches of natural science dealing with the structure and behavior of living organisms

Other hypernyms of craniology include bioscience.

craniology (noun)	life science (noun)
the scientific study of the skulls of various human races	any of the branches of natural science dealing with the structure and behavior of living organisms