metropolis vs Aquila

metropolis and Aquila both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Aquila	Yes	No	No	No

metropolis (noun)	Aquila (noun)
people living in a large densely populated municipality	a genus of Accipitridae, containing the true eagles (Aquila)
a large and densely populated urban area; may include several independent administrative districts	the provincial capital of the Abruzzi region in central Italy
	a constellation in the Milky Way near Cygnus; contains the star Altair