bit vs bitty

bit is a noun but bitty is not a noun.

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

bit (noun)	bitty (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

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