What is the difference between, say, an aeroplane's pilot and an aeroplane pilot?
Are both interchangeable or synonyms? It seems unclear and ambiguous
What is the difference between, say, an aeroplane's pilot and an aeroplane pilot?
Are both interchangeable or synonyms? It seems unclear and ambiguous
They are not equivalent.
An airplane's pilot is the pilot of a particular airplane at a particular time (usually someone who is trained to do so, but not necessarily; if a flight attendant was operating an airplane because the regular pilot died, she would be the airplane's pilot despite not being formally trained in that task).
An airplane pilot is someone whose career or training has prepared them to operate airplanes in general.
The term "aeroplane", by the way, as opposed to "airplane" is quaint and generally not used at all except for artistic or marketing flourish.