swear vs swan

swear is not a noun while swan is a noun.

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

As verbs, swear and swan are synonyms defined as:

Other synonyms of swear include affirm, assert, aver, avow, verify.

swear (noun)	swan (noun)
	stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult

swear (verb)	swan (verb)
have faith or confidence in	to declare or affirm solemnly and formally as true
make a deposition; declare under oath	move about aimlessly or without any destination, often in search of food or employment
utter obscenities or profanities	sweep majestically
promise solemnly; take an oath
to declare or affirm solemnly and formally as true