There is just regular English.
There is no professional or special English.
Yes, some industries have a few fancy, big words, but it's still normal, regular English.
So, a manager does not speak a different English to a normal English person.
Fact: the word 'professional' means: someone who gets paid, compared to an amateur
who does not get paid. (Like in a sport.)
The fact is that, 'professional' has more to do with:
-being able to get to work on time
-showing respect and being honest
