A snake oil salesman; one who makes exaggerated claims about a product he sells.
A friendly unit (usually aircraft) that acts as a hostile unit in a military exercise.
One who fakes something.
An impostor or impersonator.
One who studies pharmacy.
A health professional who controls, formulates, preserves, and dispenses medications and provides medical advice and counseling on how medicines should be used in order to achieve maximum benefit, and minimal side effects in order to avoid drug interactions.