swan vs swear

swan is a noun but swear is not a noun.

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

As verbs, swan and swear are synonyms defined as:

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

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

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