biology vs cryobiology

biology and cryobiology both are nouns.

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

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

biology: the science that studies living organisms
cryobiology: the branch of biology that studies the effects of low temperatures on living tissues or organs or organisms

biology (noun)	cryobiology (noun)
the science that studies living organisms	the branch of biology that studies the effects of low temperatures on living tissues or organs or organisms
all the plant and animal life of a particular region
characteristic life processes and phenomena of living organisms