swan vs assure

swan is a noun but assure is not a noun.

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

As verbs, assure is a hyponym of swan; that is, assure is a word with a more specific, narrower meaning than swan:

Other hyponyms of swan include hold, claim, take, attest, declare, protest, tell.

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

swan (verb)	assure (verb)
to declare or affirm solemnly and formally as true	be careful or certain to do something; make certain of something
move about aimlessly or without any destination, often in search of food or employment	inform positively and with certainty and confidence
sweep majestically	assure somebody of the truth of something with the intention of giving the listener confidence
	make a promise or commitment
	make certain of