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