carefreeness vs insouciance

carefreeness and insouciance both are nouns.

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

As nouns, carefreeness and insouciance are synonyms defined as:

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

Other synonyms of carefreeness include lightheartedness, lightsomeness.

carefreeness (noun)	insouciance (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