watercraft vs boat

watercraft and boat both are nouns.

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

As nouns, boat is a hyponym of watercraft; that is, boat is a word with a more specific, narrower meaning than watercraft:

watercraft (noun)	boat (noun)
a craft designed for water transportation	a small vessel for travel on water
skill in the management of boats	a dish (often boat-shaped) for serving gravy or sauce

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