sailing vessel vs sailing ship

sailing vessel and sailing ship both are nouns.

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

As nouns, sailing vessel and sailing ship are synonyms defined as:

sailing vessel and sailing ship: a vessel that is powered by the wind; often having several masts

sailing vessel (noun)	sailing ship (noun)
a vessel that is powered by the wind; often having several masts	a vessel that is powered by the wind; often having several masts