genus Cygnus vs Cygnus

genus Cygnus and Cygnus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Cygnus	Yes	No	No	No
Cygnus	Yes	No	No	No

As nouns, genus Cygnus and Cygnus are synonyms defined as:

genus Cygnus and Cygnus: a genus of Anatidae, containing the swans (Cygnus)

genus Cygnus (noun)	Cygnus (noun)
a genus of Anatidae, containing the swans (Cygnus)	a genus of Anatidae, containing the swans (Cygnus)
	a constellation in the Northern Hemisphere between Pegasus and Draco in the Milky Way; contains a black hole