rebelliousness vs defiance

rebelliousness and defiance both are nouns.

Word	Noun	Adjective	Verb	Adverb
rebelliousness	Yes	No	No	No
defiance	Yes	No	No	No

As nouns, rebelliousness and defiance are synonyms defined as:

rebelliousness and defiance: intentionally contemptuous behavior or attitude

rebelliousness (noun)	defiance (noun)
an insubordinate act	a defiant act
intentionally contemptuous behavior or attitude	intentionally contemptuous behavior or attitude
	a hostile challenge