Melanitta nigra vs scooter

Melanitta nigra and scooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melanitta nigra	Yes	No	No	No
scooter	Yes	No	No	No

As nouns, scooter is a hypernym of Melanitta nigra; that is, scooter is a word with a broader meaning than Melanitta nigra:

Melanitta nigra: a variety of scoter
scooter: large black diving duck of northern parts of the Northern Hemisphere

Other hypernyms of Melanitta nigra include scoter.

Melanitta nigra (noun)	scooter (noun)
a variety of scoter	large black diving duck of northern parts of the Northern Hemisphere
	child's two-wheeled vehicle operated by foot
	a wheeled vehicle with small wheels and a low-powered gasoline engine geared to the rear wheel
	a sailing vessel with runners and a cross-shaped frame; suitable for traveling over ice
	a motorboat resembling a motor scooter