different between speakable vs verbalizable

English

speak +? -able

speakable (not comparable)

That can be spoken; utterable, verbalizable.
Acceptable as a topic of discussion; not subject to taboo.
- 2004, Robert I. Yufit, David Lester, Assessment, Treatment, and Prevention of Suicidal Behavior
  Once the group knows that suicide is a speakable topic […]
- 2016, Major Kwark in Ratchet and Clank (film), 75m
  Arrest this man for his speakable crimes against the galaxy.
(obsolete) Capable of speech.

verbalize +? -able

verbalizable (not comparable)

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