billystick vs nightstick

billystick and nightstick both are nouns.

Word	Noun	Adjective	Verb	Adverb
billystick	Yes	No	No	No
nightstick	Yes	No	No	No

As nouns, billystick and nightstick are synonyms defined as:

billystick and nightstick: a short stout club used primarily by policemen

Other synonyms of billystick include baton, billy, billy club, truncheon.

billystick (noun)	nightstick (noun)
a short stout club used primarily by policemen	a short stout club used primarily by policemen