Saint Lawrence vs river

Saint Lawrence and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Lawrence	Yes	No	No	No
river	Yes	No	No	No

Saint Lawrence (noun)	river (noun)
a North American river; flows into the Gulf of Saint Lawrence and the North Atlantic	a large natural stream of water (larger than a creek)
Roman martyr; supposedly Lawrence was ordered by the police to give up the church's treasure and when he responded by presenting the poor people of Rome he was roasted to death on a gridiron (died in 258)