black body vs blackbody

black body and blackbody both are nouns.

Word	Noun	Adjective	Verb	Adverb
black body	Yes	No	No	No
blackbody	Yes	No	No	No

As nouns, black body and blackbody are synonyms defined as:

black body and blackbody: a hypothetical object capable of absorbing all the electromagnetic radiation falling on it

Other synonyms of black body include full radiator.

black body (noun)	blackbody (noun)
a hypothetical object capable of absorbing all the electromagnetic radiation falling on it	a hypothetical object capable of absorbing all the electromagnetic radiation falling on it