graser

As nouns the difference between grasser and graser

is that grasser is (british|slang) a grass (informer) while graser is (physics|science fiction) a device for the coherent amplification or generation of electromagnetic radiation in the gamma ray wavelength by the use of excitation energy in resonant atomic or molecular systems.

As nouns the difference between grater and graser

is that grater is a tool with which one grates, especially cheese, to facilitate getting small particles or shreds off a solid lump while graser is a device for the coherent amplification or generation of electromagnetic radiation in the gamma ray wavelength by the use of excitation energy in resonant atomic or molecular systems.