vessel vs bareboat

vessel and bareboat both are nouns.

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

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

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

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