“MUSSILY” is a valid word. — 12 points Scrabble

missa young woman
slimtake off weight
sumsa quantity of money
sluma district of a city marked by poverty and inferior living conditions
sims
mussa state of confusion and disorderliness
milsa Cypriot monetary unit equal to one thousandth of a pound
ismsa belief (or system of beliefs) accepted as authoritative by some group or school
lums
limy
syli

sisa female person who has the same parents as another person
suma quantity of money
slymarked by skill in deception
yum
sim
mila Cypriot monetary unit equal to one thousandth of a pound
lum
lis
mis
mustype genus of the Muridae: common house mice; the tips of the upper incisors have a square notch
isma belief (or system of beliefs) accepted as authoritative by some group or school

ishave the quality of being; (copula, used with an adjective or a predicate noun)
my
usNorth American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
um
lia soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
midestruction of heart tissue resulting from obstruction of the blood supply to the heart muscle
sia tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
muthe 12th letter of the Greek alphabet

MUSSILY