The difference between Thought balloon and Thought bubble
When used as nouns, thought balloon means a shape like a speech bubble, but conveying thought, typically emanating from the thinker by a path of small circles, whereas thought bubble means a rounded or cloud-shaped outline, containing words, representing thought in a cartoon.
check bellow for the other definitions of Thought balloon and Thought bubble
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Thought balloon as a noun (comics):
A shape like a speech bubble, but conveying thought, typically emanating from the thinker by a path of small circles.
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Thought bubble as a noun:
A rounded or cloud-shaped outline, containing words, representing thought in a cartoon.
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Thought bubble as a noun (idiomatic):
An ill-conceived idea.