genus Psittacula vs bird genus

genus Psittacula and bird genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Psittacula	Yes	No	No	No
bird genus	Yes	No	No	No

As nouns, bird genus is a hypernym of genus Psittacula; that is, bird genus is a word with a broader meaning than genus Psittacula:

genus Psittacula: a genus of Psittacidae, commonly known as Afro-Asian ringnecked parakeets (Psittacula)
bird genus: a genus of birds

genus Psittacula (noun)	bird genus (noun)
a genus of Psittacidae, commonly known as Afro-Asian ringnecked parakeets (Psittacula)	a genus of birds