boat vs registered

boat is a noun but registered is not a noun.

Word	Noun	Adjective	Verb	Adverb
boat	Yes	No	Yes	No
registered	No	Yes	No	No

boat (noun)	registered (noun)
a small vessel for travel on water
a dish (often boat-shaped) for serving gravy or sauce

boat (adjective)	registered (adjective)
	listed or recorded officially
	(of animals) officially recorded with or certified by a recognized breed association; especially in a stud book
	(of a boat or vessel) furnished with necessary official documents specifying ownership etc

boat (verb)	registered (verb)
ride in a boat on water