As nouns the difference between jumbler and fumbler
is that jumbler is one who jumbles, muddles, or confuses while fumbler is agent noun of fumble; one who fumbles.
jumbler
English
Noun
(
en noun)
One who jumbles, muddles, or confuses.
* 1864 , Transactions of the Vermont Medical Society (page 329)
- They are jumblers , who never succeed in effecting obvious relations between their conclusions and their premises.