Halcyon vs bird genus

Halcyon and bird genus both are nouns.

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

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

Halcyon: a large kingfisher widely distributed in warmer parts of the Old World
bird genus: a genus of birds

Halcyon (noun)	bird genus (noun)
a large kingfisher widely distributed in warmer parts of the Old World	a genus of birds
(Greek mythology) a woman who was turned into a kingfisher