I see you still haven't found the dictionary then Ernie.
LASER stands for
Light Amplification by Stimulated Emission of Radiation, as anyone who has studied physics should know.
And MASER stands for
Microwave Amplification by Stimulated Emission of Radiation.
Notice how I have the ability to put more than two words together that actually make sense, and do not veer off into complete gibberish. Your reliance on wikipedia is appalling.