knickers vs breeches

knickers and breeches both are nouns.

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

As nouns, knickers and breeches are synonyms defined as:

knickers and breeches: (used in the plural) trousers ending above the knee

Other synonyms of knickers include knee breeches, knee pants, knickerbockers.

knickers (noun)	breeches (noun)
(used in the plural) underpants worn by women	(used in the plural) trousers ending above the knee
(used in the plural) trousers ending above the knee