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

canal(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
callaSouth African plant widely cultivated for its showy pure white spathe and yellow spadix
alulascalelike structure between the base of the wing and the halter of a two-winged fly
lauan

calla telephone connection
alan
clangroup of people related by blood or marriage
luna(Roman mythology) the goddess of the Moon; counterpart of Greek Selene
analof or related to the anus
nulla quantity of no importance
ulnathe inner and longer of the two bones of the human forearm
cullthe person or thing that is rejected or set aside as inferior in quality
ulan
caulpart of the peritoneum attached to the stomach and to the colon and covering the intestines

canairtight sealed metal container for food or drink or paint etc.
allquantifier; used with either mass or count nouns to indicate the whole number or amount of or every one of a class
anamother of the ancient Irish gods; sometimes identified with Danu
lacresinlike substance secreted by certain lac insects; used in e.g. varnishes and sealing wax
alaa flat wing-shaped process or winglike part of an organism
aal

anan associate degree in nursing
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
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)
unan organization of independent states formed in 1945 to promote international peace and security
aaa dry form of lava resembling clinkers
nuthe 13th letter of the Greek alphabet

LACUNAL