As nouns the difference between duller and luller
is that duller is one who, or that which, dulls while luller is one who, or that which, lulls.
As an adjective duller
is comparative of dull.
duller
English
Adjective
(head)
(dull)
Noun
(
en noun)
One who, or that which, dulls.
* Beaumont and Fletcher
- But, of all, your grace must fly phlebotomy, fresh pork, conger, and clarified whey: they are all dullers of the vital spirits.