Cygnus vs genus Cygnus

Cygnus and genus Cygnus both are nouns.

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

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

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

Cygnus (noun)	genus 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