ketch vs sailing vessel

ketch and sailing vessel both are nouns.

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

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

ketch: a sailing vessel with two masts; the mizzen is forward of the rudderpost
sailing vessel: a vessel that is powered by the wind; often having several masts

Other hypernyms of ketch include sailing ship.

ketch (noun)	sailing vessel (noun)
a sailing vessel with two masts; the mizzen is forward of the rudderpost	a vessel that is powered by the wind; often having several masts