dumbfound

As verbs the difference between dumbfound and baffle

is that dumbfound is to confuse and bewilder; to leave speechless while baffle is (obsolete) to publicly disgrace, especially of a recreant knight.

As a noun baffle is

a device used to dampen the effects of such things as sound, light, or fluid specifically, a baffle is a surface which is placed inside an open area to inhibit direct motion from one part to another, without preventing motion altogether.

As a verb dumbfound

is to confuse and bewilder; to leave speechless.

As a noun dumbfounder is

someone who or that which dumbfounds.