swear vs cuss

swear is not a noun while cuss is a noun.

Word	Noun	Adjective	Verb	Adverb
swear	No	No	Yes	No
cuss	Yes	No	Yes	No

As verbs, swear and cuss are synonyms defined as:

Other synonyms of swear include blaspheme, curse, imprecate.

swear (noun)	cuss (noun)
	profane or obscene expression usually of surprise or anger
	a persistently annoying person
	a boy or man

swear (verb)	cuss (verb)
have faith or confidence in	utter obscenities or profanities
make a deposition; declare under oath
utter obscenities or profanities
promise solemnly; take an oath
to declare or affirm solemnly and formally as true