As adjectives the difference between zitty and bitty
is that zitty is (informal) characterized by zits; pimply while bitty is containing bits; fragmented.
As a noun bitty is
.
zitty
English
Adjective
(er)
(informal) Characterized by zits; pimply bitty
English
Adjective
(er)
Containing bits; fragmented
Very small
Noun
(bitties)