An exploratory DOCTOR is known as… a “doctor.”
An exploratory WELDER is known as… a “welder.”
An exploratory PILOT is known as… a “pilot.”
An exploratory WRITER is known as… a “writer.”
An exploratory SCIENTIST is known as… a “scientist.”
An exploratory TRUCK DRIVER is known as… a “truck driver.”

A non-exploratory doctor is known as… “irresponsible.”
A non-exploratory welder is known as… “irresponsible.”
A non-exploratory pilot is known as… “killed in a plane crash.”
A non-exploratory writer known as… “a plagiarist.”
A non-exploratory scientist is known as… “a tobacco company scientist.” (also “Creationist”)
A non-exploratory truck driver is known as… “lost.”

Can you spot the pattern here?

There is no such thing as an “exploratory tester” except inasmuch as a good tester obviously can and will do exploration as a basic part of his work.