astrobiology vs space biology

astrobiology and space biology both are nouns.

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

As nouns, astrobiology and space biology are synonyms defined as:

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

Other synonyms of astrobiology include exobiology.

astrobiology (noun)	space biology (noun)
the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life	the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life