Anas americana vs Anas penelope

Anas americana and Anas penelope both are nouns.

Word	Noun	Adjective	Verb	Adverb
Anas americana	Yes	No	No	No
Anas penelope	Yes	No	No	No

As nouns, Anas penelope is a hypernym of Anas americana; that is, Anas penelope is a word with a broader meaning than Anas americana:

Anas americana: a widgeon the male of which has a white crown
Anas penelope: freshwater duck of Eurasia and northern Africa related to mallards and teals

Other hypernyms of Anas americana include widgeon, wigeon.

Anas americana (noun)	Anas penelope (noun)
a widgeon the male of which has a white crown	freshwater duck of Eurasia and northern Africa related to mallards and teals