slaphappy vs harum-scarum

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

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

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

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

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

slaphappy (adjective)	harum-scarum (adjective)
dazed from or as if from repeated blows	cheerfully irresponsible
cheerfully irresponsible

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