space biology vs biology

space biology and biology both are nouns.

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

As nouns, biology is a hypernym of space biology; that is, biology is a word with a broader meaning than space biology:

space biology: the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life
biology: the science that studies living organisms

Other hypernyms of space biology include biological science.

space biology (noun)	biology (noun)
the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms