stela vs Rosetta Stone

stela and Rosetta Stone both are nouns.

Word	Noun	Adjective	Verb	Adverb
stela	Yes	No	No	No
Rosetta Stone	Yes	No	No	No

stela (noun)	Rosetta Stone (noun)
an ancient upright stone slab bearing markings	a part of an inscribed granite stela that was originally about six feet tall and was set up in 196 BC; the inscriptions in hieroglyphics and Demotic and Greek gave the first clues to the decipherment of Egyptian hieroglyphics