carefreeness vs lightheartedness

carefreeness and lightheartedness both are nouns.

Word	Noun	Adjective	Verb	Adverb
carefreeness	Yes	No	No	No
lightheartedness	Yes	No	No	No

As nouns, carefreeness and lightheartedness are synonyms defined as:

carefreeness and lightheartedness: the cheerful feeling you have when nothing is troubling you

Other synonyms of carefreeness include insouciance, lightsomeness.

carefreeness (noun)	lightheartedness (noun)
the trait of being without worry or responsibility	the cheerful feeling you have when nothing is troubling you
the cheerful feeling you have when nothing is troubling you