As adjectives the difference between bulgier and bulkier
is that bulgier is (bulgy) while bulkier is (bulky).
bulgier
English
Adjective
(head)
(bulgy)
bulgy
English
Adjective
(er)
Having one or more bulges; bulging
bulkier
English
Adjective
(head)
(bulky)
bulky
English
Adjective
(er)
Being large in size, mass, or volume.
Unwieldy
(bodybuilding) Having excess body mass, especially muscle.