Electron microscope and Optical microscope

Electron microscope noun - A microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light.

Optical microscope and electron microscope are semantically related. In some cases you can use "Optical microscope" instead a noun phrase "Electron microscope".

Electron microscope and optical microscope are semantically related. You can use "Electron microscope" instead a noun phrase "Optical microscope".