“CUSSING” is a valid word. — 10 points Scrabble

usingan act that exploits or victimizes someone (treats them unfairly)
signsa perceptible indication of something not immediately apparent (as a visible clue that something has happened)
singsdeliver by singing
suinginstitute legal proceedings against; file a suit against
sinusan abnormal passage leading from a suppurating cavity to the body surface
snugsa small secluded room
cuingassist (somebody acting or reciting) by suggesting the next words of something forgotten or imperfectly learned
incusthe ossicle between the malleus and the stapes
nisusan effortful attempt to attain a goal

signa perceptible indication of something not immediately apparent (as a visible clue that something has happened)
singdeliver by singing
gunsa weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
sinsestrangement from god
sungthe imperial dynasty of China from 960 to 1279; noted for art and literature and philosophy
sunsthe star that is the source of light and heat for the planets in the solar system
snuga small secluded room
cussa persistently annoying person
ginsstrong liquor flavored with juniper berries
gnuslarge African antelope having a head with horns like an ox and a long tufted tail
sicsurge to attack someone
unci(biology) any hook-shaped process or part

guna weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
sunthe star that is the source of light and heat for the planets in the solar system
sinestrangement from god
sisa female person who has the same parents as another person
ginstrong liquor flavored with juniper berries
insan agency in the Department of Justice that enforces laws and regulations for the admission of foreign-born persons to the United States
sicurge to attack someone
uns
cisan alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991
gnularge African antelope having a head with horns like an ox and a long tufted tail
nus

ishave the quality of being; (copula, used with an adjective or a predicate noun)
ina unit of length equal to one twelfth of a foot
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
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
unan organization of independent states formed in 1945 to promote international peace and security
nuthe 13th letter of the Greek alphabet

CUSSING