carefree vs happy-go-lucky

carefree and happy-go-lucky both are adjectives.

Word	Noun	Adjective	Verb	Adverb
carefree	No	Yes	No	No
happy-go-lucky	No	Yes	No	No

As adjectives, carefree and happy-go-lucky are synonyms defined as:

Other synonyms of carefree include devil-may-care, freewheeling, harum-scarum, slaphappy.

carefree (adjective)	happy-go-lucky (adjective)
cheerfully irresponsible	cheerfully irresponsible
free of trouble and worry and care