scooter vs sea scooter

scooter and sea scooter both are nouns.

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

As nouns, scooter and sea scooter are synonyms defined as:

Other synonyms of scooter include water scooter.

scooter (noun)	sea scooter (noun)
large black diving duck of northern parts of the Northern Hemisphere	a motorboat resembling a motor scooter
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