Act and Action
Action used as a singular countable noun has almost the same meaning as act. You can say:
This is a very kind act/action.
But in certain fixed phrases, you should use act, not action.
Incorrect : It was an action of cruelty.
Correct : It was an act of cruelty.
Action can be used in various senses where it cannot be replaced by act.
Incorrect : The police had to take firm act to deal with the murder.
Correct : The police had to take firm action to deal with the murder.
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