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

surehaving or feeling no doubt or uncertainty; confident and assured
curea medicine or therapy that cures disease or relieve pain
usera person who makes use of a thing; someone who uses or employs something
rusea deceptive maneuver (especially to avoid capture)
cuesan actor's line that immediately precedes and serves as a reminder for some action or speech
cursan inferior dog or one of mixed breed
ecrua very light brown
suera man who courts a woman
ecus
ruesEuropean strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy
recs
crusthe leg from the knee to foot

usethe act of using
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
rueEuropean strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy
rec
ser
resa widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
curan inferior dog or one of mixed breed
ers
ecu

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
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
esa radioactive transuranic element produced by bombarding plutonium with neutrons

CERCUS