knickers vs pants

knickers and pants both are nouns.

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

As nouns, knickers and pants are synonyms defined as:

Other synonyms of knickers include bloomers, drawers.

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