Szechwan province vs Szechuan

Szechwan province and Szechuan both are nouns.

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

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

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

Other synonyms of Szechwan province include Sichuan, Szechwan.

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