buckskins vs breeches

buckskins and breeches both are nouns.

Word	Noun	Adjective	Verb	Adverb
buckskins	Yes	No	No	No
breeches	Yes	No	No	No

As nouns, breeches is a hypernym of buckskins; that is, breeches is a word with a broader meaning than buckskins:

Other hypernyms of buckskins include knee breeches, knee pants, knickerbockers, knickers.

buckskins (noun)	breeches (noun)
(used in the plural) breeches made of buckskin	(used in the plural) trousers ending above the knee