swan vs affirm

swan is a noun but affirm is not a noun.

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

As verbs, swan and affirm are synonyms defined as:

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

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

swan (verb)	affirm (verb)
to declare or affirm solemnly and formally as true	establish or strengthen as with new evidence or facts
move about aimlessly or without any destination, often in search of food or employment	to declare or affirm solemnly and formally as true
sweep majestically	say yes to