geographical region vs Silesia

geographical region and Silesia both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographical region	Yes	No	No	No
Silesia	Yes	No	No	No

geographical region (noun)	Silesia (noun)
a demarcated area of the Earth	a region of central Europe rich in deposits of coal and iron ore; annexed by Prussia in 1742 but now largely in Poland