boat vs watercraft

boat and watercraft both are nouns.

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

As nouns, watercraft is a hypernym of boat; that is, watercraft is a word with a broader meaning than boat:

Other hypernyms of boat include vessel.

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

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