scooter vs powerboat

scooter and powerboat both are nouns.

Word	Noun	Adjective	Verb	Adverb
scooter	Yes	No	No	No
powerboat	Yes	No	No	No

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

Other hypernyms of scooter include motorboat.

scooter (noun)	powerboat (noun)
large black diving duck of northern parts of the Northern Hemisphere	a boat propelled by an internal-combustion engine
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