curse word vs expletive

curse word and expletive both are nouns.

Word	Noun	Adjective	Verb	Adverb
curse word	Yes	No	No	No
expletive	Yes	No	No	No

As nouns, curse word and expletive are synonyms defined as:

curse word and expletive: profane or obscene expression usually of surprise or anger

Other synonyms of curse word include curse, cuss, oath, swearing, swearword.

curse word (noun)	expletive (noun)
profane or obscene expression usually of surprise or anger	profane or obscene expression usually of surprise or anger
	a word or phrase conveying no independent meaning but added to fill out a sentence or metrical line