dandy vs sailing vessel

dandy and sailing vessel both are nouns.

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

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

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

Other hypernyms of dandy include sailing ship.

dandy (noun)	sailing vessel (noun)
a sailing vessel with two masts; a small mizzen is aft of the rudderpost	a vessel that is powered by the wind; often having several masts
a man who is much concerned with his dress and appearance

dandy (adjective)	sailing vessel (adjective)
excellent