salopettes vs trousers

salopettes and trousers both are nouns.

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

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

salopettes: trousers usually of stretch material and kept taut by a strap under the foot, worn for skiing or as a fashion garment.
trousers: (usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately

Other hypernyms of salopettes include pair of trousers, pant.

salopettes (noun)	trousers (noun)
trousers usually of stretch material and kept taut by a strap under the foot, worn for skiing or as a fashion garment.	(usually in the plural) a garment extending from the waist to the knee or ankle, covering each leg separately