expletive vs curse word

expletive and curse word both are nouns.

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

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

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

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

expletive (noun)	curse word (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