estraterrestrial body vs extraterrestrial object

estraterrestrial body and extraterrestrial object both are nouns.

Word	Noun	Adjective	Verb	Adverb
estraterrestrial body	Yes	No	No	No
extraterrestrial object	Yes	No	No	No

As nouns, estraterrestrial body and extraterrestrial object are synonyms defined as:

estraterrestrial body and extraterrestrial object: a natural object existing outside the earth and outside the earth's atmosphere

estraterrestrial body (noun)	extraterrestrial object (noun)
a natural object existing outside the earth and outside the earth's atmosphere	a natural object existing outside the earth and outside the earth's atmosphere