galleon vs sailing ship

galleon and sailing ship both are nouns.

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

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

galleon: a large square-rigged sailing ship with three or more masts; used by the Spanish for commerce and war from the 15th to 18th centuries
sailing ship: a vessel that is powered by the wind; often having several masts

Other hypernyms of galleon include sailing vessel.

galleon (noun)	sailing ship (noun)
a large square-rigged sailing ship with three or more masts; used by the Spanish for commerce and war from the 15th to 18th centuries	a vessel that is powered by the wind; often having several masts