“UNSUCCESS” is a valid word.

cuscuseswoolly-haired monkey-like arboreal marsupial of New Guinea and northern Australia

censusa periodic count of the population
cussesa persistently annoying person
cuscuswoolly-haired monkey-like arboreal marsupial of New Guinea and northern Australia
cusecs

usesthe act of using
nessa strip of land projecting into a body of water
sunsthe star that is the source of light and heat for the planets in the solar system
cussa persistently annoying person
cuesan actor's line that immediately precedes and serves as a reminder for some action or speech
susstype genus of the Suidae
suesFrench writer whose novels described the sordid side of city life (1804-1857)
secs1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
cess
ecus

usethe act of using
sunthe star that is the source of light and heat for the planets in the solar system
sueFrench writer whose novels described the sordid side of city life (1804-1857)
sec1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
cuean actor's line that immediately precedes and serves as a reminder for some action or speech
sena fractional monetary unit of Japan and Indonesia and Cambodia; equal to one hundredth of a yen or rupiah or riel
uns
ess
ecu
nus
ens

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
enhalf the width of an em
unan organization of independent states formed in 1945 to promote international peace and security
esa radioactive transuranic element produced by bombarding plutonium with neutrons
nea colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts
nuthe 13th letter of the Greek alphabet

UNSUCCESS