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

classa collection of things sharing a common attribute
sailsa large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
sisala plant fiber used for making rope
salic
laics
sialsthe granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum

saila large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel
lassa girl or young woman who is unmarried
sassan impudent or insolent rejoinder
ailsaromatic bulb used as seasoning
lacsresinlike substance secreted by certain lac insects; used in e.g. varnishes and sealing wax
sacsan enclosed space
sicsurge to attack someone
laiccharacteristic of those who are not members of the clergy
ascisaclike structure in which ascospores are formed through sexual reproduction of ascomycetes
sals
sialthe granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum

assthe fleshy part of the human body that you sit on
sisa female person who has the same parents as another person
las
sal
sacan enclosed space
lis
sicurge to attack someone
lacresinlike substance secreted by certain lac insects; used in e.g. varnishes and sealing wax
alsthickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord; results in progressive muscle atrophy that starts in the limbs
cisan alliance made up of states that had been Soviet Socialist Republics in the Soviet Union prior to its dissolution in Dec 1991
ailaromatic bulb used as seasoning
ais

ishave the quality of being; (copula, used with an adjective or a predicate noun)
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
laa white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
ala silvery ductile metallic element found primarily in bauxite
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
aian agency of the United States Army responsible for providing timely and relevant and accurate and synchronized intelligence to tactical and operational and strategic level commanders

CLASSIS