roam vs swan

roam is not a noun while swan is a noun.

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

As verbs, roam and swan are synonyms defined as:

roam and swan: move about aimlessly or without any destination, often in search of food or employment

Other synonyms of roam include cast, drift, ramble, range, roll, rove, stray, tramp, vagabond, wander.

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

roam (verb)	swan (verb)
move about aimlessly or without any destination, often in search of food or employment	to declare or affirm solemnly and formally as true
	move about aimlessly or without any destination, often in search of food or employment
	sweep majestically