brig vs sailing ship

brig and sailing ship both are nouns.

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

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

brig: two-masted sailing vessel square-rigged on both masts
sailing ship: a vessel that is powered by the wind; often having several masts

Other hypernyms of brig include sailing vessel.

brig (noun)	sailing ship (noun)
a penal institution (especially on board a ship)	a vessel that is powered by the wind; often having several masts
two-masted sailing vessel square-rigged on both masts