As adjectives the difference between bumpier and jumpier
is that bumpier is comparative of bumpy while jumpier is comparative of jumpy.
bumpier
English
Adjective
(head)
(bumpy)
bumpy
English
Adjective
(er)
rough; jumpy; causing or characterized by jolts and irregular movements
covered with or full of bumps
jumpier
English
Adjective
(head)
(jumpy)
jumpy
English
Adjective
(er)
Nervous and excited.