Sichuan vs Szechwan province

Sichuan and Szechwan province both are nouns.

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

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

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

Other synonyms of Sichuan include Szechuan, Szechwan.

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