“OVISACS” is a valid word. — 12 points Scrabble

oasisa fertile tract in a desert (where the water table approaches the surface)
visasan endorsement made in a passport that allows the bearer to enter the country issuing it
aviso
ossia

ciaoan acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian)
visaan endorsement made in a passport that allows the bearer to enter the country issuing it
sacsan enclosed space
ossaa mouth or mouthlike opening
sicsurge to attack someone
ascisaclike structure in which ascospores are formed through sexual reproduction of ascomycetes
vacsinformal term for vacation
avos100 avos equal 1 pataca in Macao
coss(in India) a unit of length having different values in different localities
ocasSouth American wood sorrel cultivated for its edible tubers

assthe fleshy part of the human body that you sit on
cosratio of the adjacent side to the hypotenuse of a right-angled triangle
sisa female person who has the same parents as another person
via
sosan internationally recognized distress signal in radio code
sacan enclosed space
sicurge to attack someone
vasa tube in which a body fluid circulates
vacinformal term for vacation
vis
cisan alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991
ais
ovathe female reproductive cell; the female gamete
ocaSouth American wood sorrel cultivated for its edible tubers
avo100 avos equal 1 pataca in Macao

ishave the quality of being; (copula, used with an adjective or a predicate noun)
sothe syllable naming the fifth (dominant) note of any musical scale in solmization
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
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
aian agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders
osa mouth or mouthlike opening

OVISACS