river vs Limpopo

river and Limpopo both are nouns.

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

river (noun)	Limpopo (noun)
a large natural stream of water (larger than a creek)	the second largest river in Africa that drains into the Indian Ocean; flows into the Indian Ocean