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

boya youthful male person
bayan indentation of a shoreline larger than a cove but smaller than a gulf
batnocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate
toyan artifact designed to be played with
tabthe bill in a restaurant
taoan adherent of any branch of Taoism
tattastelessness by virtue of being cheap and vulgar
botbotfly larva; typically develops inside the body of a horse or sheep or human
boaa long thin fluffy scarf of feathers or fur
baathe cry made by sheep
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
abaa loose sleeveless outer garment made from aba cloth; worn by Arabs
aboa dark-skinned member of a race of people living in Australia when Europeans arrived
abymake amends for
yoba cruel and brutal fellow

to
ata highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
byso as to pass a given point
ya
yo
bo
ay
taa hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
baa soft silvery metallic element of the alkali earth group; found in barite
oy
aaa dry form of lava resembling clinkers
aba bachelor's degree in arts and sciences

ATTABOY