pleasure boat vs powerboat

pleasure boat and powerboat both are nouns.

Word	Noun	Adjective	Verb	Adverb
pleasure boat	Yes	No	No	No
powerboat	Yes	No	No	No

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

pleasure boat: a large motorboat that has a cabin and plumbing and other conveniences necessary for living on board
powerboat: a boat propelled by an internal-combustion engine

Other hypernyms of pleasure boat include motorboat.

pleasure boat (noun)	powerboat (noun)
a large motorboat that has a cabin and plumbing and other conveniences necessary for living on board	a boat propelled by an internal-combustion engine