As an adjective zestier
is comparative of zesty.
As a noun zester is
a kitchen implement used to remove the zest of citrus fruit.
zestier
English
Adjective
(head)
(zesty)
zesty
English
Adjective
(en-adj)
Having a piquant or pungent taste; spicy.
Zestful.
zester
English
Noun
(
en noun)
A kitchen implement used to remove the zest of citrus fruit.