river vs Sambre

river and Sambre both are nouns.

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

river (noun)	Sambre (noun)
a large natural stream of water (larger than a creek)	a river in western Europe that rises in northern France and flows generally east into Belgium where it joins the Meuse at Namur