No, it's a term-of-art. When people muddy the waters and try to undermine the standard terminology of a field, it's not some righteous struggle to liberate a term, it's just an obstacle to clear communication.
In aviation, flap is a precise term-of-art, and is never used interchangeably with aileron, despite that an aileron is plainly a kind of flap (in the colloquial sense). If you adopt your own definition of flap, to refer to both flaps and ailerons, no-one is going to sue you, but no-one is going to know what you're talking about. Your use of the term will be considered not merely different, but wrong.
Similarly, you could try telling a physicist that you consider the words power and force to be interchangeable. They're not going to sue you, but they're also not likely to entertain your deliberate misuse of standard terms.
Are pilots and physicists gatekeeping by being so insistent that you use their terms their way?