St. Louis vs city

St. Louis and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
St. Louis	Yes	No	No	No
city	Yes	No	No	No

St. Louis (noun)	city (noun)
the largest city in Missouri; a busy river port on the Mississippi River near its confluence with the Missouri River; was an important staging area for wagon trains westward in the 19th century	people living in a large densely populated municipality
king of France and son of Louis VIII; he led two unsuccessful Crusades; considered an ideal medieval king (1214-1270)	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter