carefree vs harum-scarum

carefree is not a noun while harum-scarum is a noun.

Word	Noun	Adjective	Verb	Adverb
carefree	No	Yes	No	No
harum-scarum	Yes	Yes	No	Yes

As adjectives, carefree and harum-scarum are synonyms defined as:

Other synonyms of carefree include devil-may-care, freewheeling, happy-go-lucky, slaphappy.

carefree (noun)	harum-scarum (noun)
	a reckless impetuous irresponsible person

carefree (adjective)	harum-scarum (adjective)
cheerfully irresponsible	cheerfully irresponsible
free of trouble and worry and care

carefree (adverb)	harum-scarum (adverb)
	in a wild or reckless manner