background processing vs backgrounding

background processing and backgrounding both are nouns.

Word	Noun	Adjective	Verb	Adverb
background processing	Yes	No	No	No
backgrounding	Yes	No	No	No

As nouns, background processing and backgrounding are synonyms defined as:

background processing and backgrounding: the execution of low priority programs while higher priority programs are not using the processing system

background processing (noun)	backgrounding (noun)
the execution of low priority programs while higher priority programs are not using the processing system	the execution of low priority programs while higher priority programs are not using the processing system