extraterrestrial object vs estraterrestrial body

extraterrestrial object and estraterrestrial body both are nouns.

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

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

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

extraterrestrial object (noun)	estraterrestrial body (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