exobiology vs astrobiology

exobiology and astrobiology both are nouns.

Word	Noun	Adjective	Verb	Adverb
exobiology	Yes	No	No	No
astrobiology	Yes	No	No	No

As nouns, exobiology and astrobiology are synonyms defined as:

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

Other synonyms of exobiology include space biology.

exobiology (noun)	astrobiology (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