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DIRTYMIND The correct terminology is called "becoming a pilot"!
Based on what an airline pilot friend of mine has spoken of frequently, is this very fact. You can get a private pilot license and call yourself a 'pilot'.
You can get a commercial pilot license but you cannot call yourself a 'commercial pilot' unless you actually have a piloting job where you're earning a living from your commercial pilots license.
If you are an unemployed commercial pilot, you are now called a 'pilot' again.
If you hold an airline transport license and are employed by a bonafide air carrier which has airline designated status by a governing agency, you are now called an 'airline pilot'.
But if you become laid off or otherwise unemployed as a airline pilot, you are now called a 'pilot' again.