Szechwan province vs Sichuan

Szechwan province and Sichuan both are nouns.

Word	Noun	Adjective	Verb	Adverb
Szechwan province	Yes	No	No	No
Sichuan	Yes	No	No	No

As nouns, Szechwan province and Sichuan are synonyms defined as:

Szechwan province and Sichuan: a populous province of south central China

Other synonyms of Szechwan province include Szechuan, Szechwan.

Szechwan province (noun)	Sichuan (noun)
a populous province of south central China	a populous province of south central China