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

tankan enclosed armored military vehicle; has a cannon and moves on caterpillar treads
ranka row or line of people (especially soldiers or police) standing abreast of one another
ranta loud bombastic declamation expressed with strong emotion
tarna mountain lake (especially one formed by glaciers)
karn
kart
narkan informer or spy working for the police
knar

ranmove fast by using one's feet, with one foot off the ground at any given time
artthe products of human creativity; works of art collectively
ratany of various long-tailed rodents similar to but larger than a mouse
tana browning of the skin resulting from exposure to the rays of the sun
katthe leaves of the shrub Catha edulis which are chewed like tobacco or used to make tea; has the effect of a euphoric stimulant
antsocial insect living in organized colonies; characteristically the males and fertile queen have wings during breeding season; wingless sterile females are the workers
ark(Judaism) sacred chest where the ancient Hebrews kept the two tablets containing the Ten Commandments
tarany of various dark heavy viscid substances obtained as a residue

ata highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
anan associate degree in nursing
naa silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)
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
kaunknown god; an epithet of Prajapati and Brahma

TRANK