“LIMPSY” is a valid word. — 13 points Scrabble

lipseither of two fleshy folds of tissue that surround the mouth and play a role in speaking
slipa socially awkward or tactless act
slimtake off weight
limpthe uneven manner of walking that results from an injured leg
lispa speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th'
yipsnervous tension that causes an athlete to fail (especially causes golfers to miss short putts)
milsa Cypriot monetary unit equal to one thousandth of a pound
imps(folklore) fairies that are somewhat mischievous
simp
limy
pily
syli

spy(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
lipeither of two fleshy folds of tissue that surround the mouth and play a role in speaking
sipa small drink
slymarked by skill in deception
sim
mila Cypriot monetary unit equal to one thousandth of a pound
yipa sharp high-pitched cry (especially by a dog)
psia unit of pressure
lis
mis
imp(folklore) fairies that are somewhat mischievous
plyone of the strands twisted together to make yarn or rope or thread; often used in combination
pis
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
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
pithe ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...

LIMPSY