Silvia vs bird genus

Silvia and bird genus both are nouns.

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

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

Silvia (noun)	bird genus (noun)
type genus of the Sylviidae: warblers	a genus of birds