gibberer

As a noun gibberer

is one who gibbers (talks rapidly and incoherently).

As a verb gibbered is

past tense of gibber; to talk incomprehensibly.

As an adjective incoherent

is lacking coherence or agreement; incongruous; inconsistent; not logically connected.

As a noun gibberer is

one who gibbers (talks rapidly and incoherently).

As nouns the difference between gibber and gibberer

is that gibber is gibberish, unintelligible speech while gibberer is one who gibbers (talks rapidly and incoherently).

As a verb gibber

is to jabber, talk rapidly and unintelligibly or incoherently.