swan vs roam

swan is a noun but roam is not a noun.

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

As verbs, swan and roam are synonyms defined as:

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

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

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

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