vessel vs racing yacht

vessel and racing yacht both are nouns.

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

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

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

vessel (noun)	racing 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