ground noise vs background noise

ground noise and background noise both are nouns.

Word	Noun	Adjective	Verb	Adverb
ground noise	Yes	No	No	No
background noise	Yes	No	No	No

As nouns, ground noise and background noise are synonyms defined as:

ground noise and background noise: extraneous noise contaminating sound measurements that cannot be separated from the desired signal

ground noise (noun)	background noise (noun)
extraneous noise contaminating sound measurements that cannot be separated from the desired signal	extraneous noise contaminating sound measurements that cannot be separated from the desired signal