Cygnus cygnus vs swan

Cygnus cygnus and swan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cygnus cygnus	Yes	No	No	No
swan	Yes	No	Yes	No

As nouns, swan is a hypernym of Cygnus cygnus; that is, swan is a word with a broader meaning than Cygnus cygnus:

Cygnus cygnus: common Old World swan noted for its whooping call
swan: stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult

Cygnus cygnus (noun)	swan (noun)
common Old World swan noted for its whooping call	stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult

Cygnus cygnus (verb)	swan (verb)
	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