bitty vs bit

bitty is not a noun while bit is a noun.

Word	Noun	Adjective	Verb	Adverb
bitty	No	Yes	No	No
bit	Yes	No	No	No

bitty (noun)	bit (noun)
	the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press
	piece of metal held in horse's mouth by reins and used to control the horse while riding
	the part of a key that enters a lock and lifts the tumblers
	a short performance that is part of a longer program
	a small fragment
	an instance of some kind
	a small amount of solid food; a mouthful
	a small fragment of something broken off from the whole
	a unit of measurement of information (from binary + digit); the amount of information in a system having two equiprobable states
	a small piece or quantity of something
	an indefinitely short time

bitty (adjective)	bit (adjective)
(used informally) little or tiny