swear vs swearer

swear is not a noun while swearer is a noun.

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

swear (noun)	swearer (noun)
	someone who takes a solemn oath
	someone who uses profanity

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