idling vs idleness

idling and idleness both are nouns.

Word	Noun	Adjective	Verb	Adverb
idling	Yes	No	No	No
idleness	Yes	No	No	No

As nouns, idling and idleness are synonyms defined as:

Other synonyms of idling include loafing.

idling (noun)	idleness (noun)
having no employment	having no employment
	the trait of being idle out of a reluctance to work
	the quality of lacking substance or value