common scoter vs scooter

common scoter and scooter both are nouns.

Word	Noun	Adjective	Verb	Adverb
common scoter	Yes	No	No	No
scooter	Yes	No	No	No

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

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

Other hypernyms of common scoter include scoter.

common scoter (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