Yes, masers is a Scrabble word!

...and is worth 8 points in Scrabble, and 9 points in Words with Friends

masers

Noun

1. An acronym for microwave amplification by stimulated emission of radiation; an amplifier that works on the same principle as a laser and emits coherent microwave radiation

What Scrabble words can I make with the letters in masers?

6 Letter Words

marses
smears

5 Letter Words

arses
mares
marse
maser
masse
mesas
rases
reams
seams
sears
smear

4 Letter Words

ares
arms
arse
ears
eras
maes
mare
mars
mass
mesa
mess
rams
rase
ream
rems
same
seam
sear
seas
sera
sers

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2 Anagrams of Masers

marses
smears

Words that can be created with an extra letter added to masers:

A:amasserC:screamsE:seamersI:massierH:marshesmashersshmearssmasherK:maskersL:armlessU:amusersassumermasseurT:mastersstreams