All mighty, is used in the sense of slang, ‘when all of those in a group are in agreement, or disagreement, about something’: “We’re all mighty glad to see you.”
Almighty, on the other hand, means ‘having absolute power; all-powerful’. God is referred to as the almighty.
Usage example that uses these 2 words: The priest shouted that we were all mighty glad to know the power of the almighty presence of the Lord.
All mighty & Almighty
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