bareboat vs vessel

bareboat and vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
bareboat	Yes	No	No	No
vessel	Yes	No	No	No

As nouns, vessel is a hypernym of bareboat; that is, vessel is a word with a broader meaning than bareboat:

bareboat: a vessel (such as a yacht) that can be chartered without a captain or crew or provisions
vessel: a craft designed for water transportation

Other hypernyms of bareboat include watercraft.

bareboat (noun)	vessel (noun)
a vessel (such as a yacht) that can be chartered without a captain or crew or provisions	a craft designed for water transportation
	an object used as a container (especially for liquids)
	a tube in which a body fluid circulates