“DASTARD” is a valid word. — 9 points Scrabble

star(astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
dataa collection of facts from which conclusions may be drawn
ratsany of various long-tailed rodents similar to but larger than a mouse
artsstudies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills)
addsa condition (mostly in boys) characterized by behavioral and learning disorders
dadsan informal term for a father; probably derived from baby talk
darta small narrow pointed missile that is thrown or shot
tsara male monarch or emperor (especially of Russia prior to 1917)
dadaan informal term for a father; probably derived from baby talk
drat
radsa unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
tradtraditional jazz as revived in the 1950s
tarsany of various dark heavy viscid substances obtained as a residue
tadsa slight amount or degree of difference
sarda deep orange-red variety of chalcedony

dadan informal term for a father; probably derived from baby talk
sadexperiencing or showing sorrow or unhappiness
artthe products of human creativity; works of art collectively
adda condition (mostly in boys) characterized by behavioral and learning disorders
satthe seventh and last day of the week; observed as the Sabbath by Jews and some Christians
ratany of various long-tailed rodents similar to but larger than a mouse
ads
tada slight amount or degree of difference
tarany of various dark heavy viscid substances obtained as a residue
rada unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
rasthe network in the reticular formation that serves an alerting or arousal function
tas
ars
aasan associate degree in applied science

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
ada public promotion of some product or service
taa hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
ara colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
aaa dry form of lava resembling clinkers

DASTARD