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

acidany of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
gagamentally or physically infirm with age
cadi
giga
caid
gadi

digthe site of an archeological exploration
aida resource
giglong and light rowing boat; especially for racing
gaga humorous anecdote or remark intended to provoke laughter
dag10 grams
cadsomeone who is morally reprehensible
agatitle for a civil or military leader (especially in Turkey)
gadan anxiety disorder characterized by chronic free-floating anxiety and such symptoms as tension or sweating or trembling or lightheadedness or irritability etc that has lasted for more than six months
gid

ida state in the Rocky Mountains
ada public promotion of some product or service
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
aaa dry form of lava resembling clinkers
aga soft white precious univalent metallic element having the highest electrical and thermal conductivity of any metal; occurs in argentite and in free form; used in coins and jewelry and tableware and photography

AGGADIC