vessel vs yacht

vessel and yacht both are nouns.

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

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

vessel: a craft designed for water transportation
yacht: an expensive vessel propelled by sail or power and used for cruising or racing

vessel (noun)	yacht (noun)
a craft designed for water transportation	an expensive vessel propelled by sail or power and used for cruising or racing
an object used as a container (especially for liquids)
a tube in which a body fluid circulates

vessel (verb)	yacht (verb)
	travel in a yacht