registered vs boat

registered is not a noun while boat is a noun.

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

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

registered (adjective)	boat (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

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