“EXCIMER” is a valid word. — 18 points Scrabble

ricegrains used as food either unpolished or more often polished
merea small pond of standing water
miceany of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails
emiran independent ruler or chieftain (especially in Africa or Arabia)
execthe chief executive department of the United States government
mirea soft wet area of low-lying land that sinks underfoot
rimeice crystals forming a white deposit (especially on objects outside)
cerethe fleshy, waxy covering at the base of the upper beak of some birds
cire
emic

icewater frozen in the solid state
mixa commercially prepared mixture of dry ingredients
rexa male sovereign; ruler of a kingdom
ere
cee
rimthe shape of a raised edge of a more or less circular object
rec
rema recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
mir
rei
ree
irea strong emotion; a feeling that is oriented toward some real or supposed grievance
eme

mea state in New England
ema quad with a square body
era trivalent metallic element of the rare earth group; occurs with yttrium
rea rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum
exa man who was formerly a certain woman's husband
midestruction of heart tissue resulting from obstruction of the blood supply to the heart muscle
xithe cardinal number that is the sum of ten and one

EXCIMER