laser vs optical maser

laser and optical maser both are nouns.

Word	Noun	Adjective	Verb	Adverb
laser	Yes	No	No	No
optical maser	Yes	No	No	No

As nouns, laser and optical maser are synonyms defined as:

laser and optical maser: an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light

laser (noun)	optical maser (noun)
an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light	an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light