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

stilla static photograph (especially one taken from a movie and used for advertising purposes)
sillya word used for misbehaving children
tillsunstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together
siltyfull of silt
liltsa jaunty rhythm in music
stylia sharp pointed device attached to the cartridge of a record player
slily
yills

tillunstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together
lista database containing an ordered array of items (names or topics)
lilyany liliaceous plant of the genus Lilium having showy pendulous flowers
slita long narrow opening
sillstructural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
illsan often persistent bodily disorder or disease; a cause for complaining
siltmud or clay or small rocks deposited by a river or lake
lilta jaunty rhythm in music
illy
yill
litsthe humanistic study of a body of literature
tils
syli

itthe branch of engineering that deals with the use of computers and telecommunications to retrieve and store and transmit information
ishave the quality of being; (copula, used with an adjective or a predicate noun)
lia soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
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
tia light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite

STILLY