Not game breaking, but I wonder… Maser or Laser?

A Maser is a type of Laser that is working the in the Microwave frequency band (Microwave Amplification by Stimulated Emission of Radiation). Laser is the more generic term (Light Ampl…) - they both work in the same way. The first laser produced was a Maser - indeed there are references to “Optical Masers” before Laser became the common generic term.

So the answer to your question is: “Maser is fine”.