“URSAE” is a valid word. — 5 points Scrabble

surehaving or feeling no doubt or uncertainty; confident and assured
earsthe sense organ for hearing and equilibrium
arsethe fleshy part of the human body that you sit on
usera person who makes use of a thing; someone who uses or employs something
ares(Greek mythology) Greek god of war; son of Zeus and Hera; identified with Roman Mars
rusea deceptive maneuver (especially to avoid capture)
seraan amber, watery fluid, rich in proteins, that separates out when blood coagulates
searmake very hot and dry
suraone of the sections (or chapters) in the Koran
erasa period marked by distinctive character or reckoned from a fixed point or event
ursa
ureathe chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics
suera man who courts a woman
ruesEuropean strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy
rasetear down so as to make flat with the ground

area unit of surface area equal to 100 square meters
usethe act of using
seaa division of an ocean or a large body of salt water partially enclosed by land
earthe sense organ for hearing and equilibrium
sueFrench writer whose novels described the sordid side of city life (1804-1857)
eraa period marked by distinctive character or reckoned from a fixed point or event
rueEuropean strong-scented perennial herb with grey-green bitter-tasting leaves; an irritant similar to poison ivy
ser
sae
resa widely distributed system consisting of all the cells able to ingest bacteria or colloidal particles etc, except for certain white blood cells
sau
eau
rasthe network in the reticular formation that serves an alerting or arousal function
ers
ars

asa very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
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
ara colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
ae

URSAE