trousers vs salopettes

trousers and salopettes both are nouns.

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

As nouns, salopettes is a hyponym of trousers; that is, salopettes is a word with a more specific, narrower meaning than trousers:

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

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