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

vastunusually great in size or amount or degree or especially extent or scope
stat
oatsannual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')
totsa small amount (especially of a drink)
tatstastelessness by virtue of being cheap and vulgar
vatsa tax levied on the difference between a commodity's price before taxes and its cost of production
vasaa tube in which a body fluid circulates
taosa member of the Pueblo people living in northern New Mexico
tost
oasta kiln for drying hops
avos100 avos equal 1 pataca in Macao
stoa
tavs

satthe seventh and last day of the week; observed as the Sabbath by Jews and some Christians
ava
taoan adherent of any branch of Taoism
tattastelessness by virtue of being cheap and vulgar
vata tax levied on the difference between a commodity's price before taxes and its cost of production
tota small amount (especially of a drink)
oatannual grass of Europe and North Africa; grains used as food and fodder (referred to primarily in the plural: `oats')
att
vasa tube in which a body fluid circulates
tas
sota chronic drinker
ovathe female reproductive cell; the female gamete
avo100 avos equal 1 pataca in Macao
aasan associate degree in applied science
tav

to
sothe syllable naming the fifth (dominant) note of any musical scale in solmization
ata highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
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
taa hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
aaa dry form of lava resembling clinkers
osa mouth or mouthlike opening

OTTAVAS