Arno vs river

Arno and river both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arno	Yes	No	No	No
river	Yes	No	No	No

Arno (noun)	river (noun)
a river in central Italy rising in the Apennines and flowing through Florence and Pisa to the Ligurian Sea	a large natural stream of water (larger than a creek)