life science vs biology

life science and biology both are nouns.

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

As nouns, biology is a hyponym of life science; that is, biology is a word with a more specific, narrower meaning than life science:

life science: any of the branches of natural science dealing with the structure and behavior of living organisms
biology: the science that studies living organisms

life science (noun)	biology (noun)
any of the branches of natural science dealing with the structure and behavior of 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