knickerbockers vs knee breeches

knickerbockers and knee breeches both are nouns.

Word	Noun	Adjective	Verb	Adverb
knickerbockers	Yes	No	No	No
knee breeches	Yes	No	No	No

As nouns, knickerbockers and knee breeches are synonyms defined as:

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

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

knickerbockers (noun)	knee breeches (noun)
(used in the plural) trousers ending above the knee	(used in the plural) trousers ending above the knee