salwar vs trousers

salwar and trousers both are nouns.

Word	Noun	Adjective	Verb	Adverb
salwar	Yes	No	No	No
trousers	Yes	No	No	No

As nouns, trousers is a hypernym of salwar; that is, trousers is a word with a broader meaning than salwar:

salwar: a pair of light loose trousers with a tight fit around the ankles; worn by women from the Indian subcontinent (usually with a kameez)
trousers: (usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately

Other hypernyms of salwar include pair of trousers, pant.

salwar (noun)	trousers (noun)
a pair of light loose trousers with a tight fit around the ankles; worn by women from the Indian subcontinent (usually with a kameez)	(usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately