sailing ship vs vessel

sailing ship and vessel both are nouns.

Word	Noun	Adjective	Verb	Adverb
sailing ship	Yes	No	No	No
vessel	Yes	No	No	No

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

sailing ship: a vessel that is powered by the wind; often having several masts
vessel: a craft designed for water transportation

Other hypernyms of sailing ship include watercraft.

sailing ship (noun)	vessel (noun)
a vessel that is powered by the wind; often having several masts	a craft designed for water transportation
	an object used as a container (especially for liquids)
	a tube in which a body fluid circulates