“KNACKED” is a valid word. — 18 points Scrabble

neckthe part of an organism (human or animal) that connects the head to the rest of the body
cakea block of solid substance (such as soap or wax)
deanan administrator in charge of a division of a university or college
deckany of various platforms built into a vessel
kane
canea stick that people can lean on to help them walk
cade
acnean inflammatory disease involving the sebaceous glands of the skin; characterized by papules or pustules or comedones
acedsucceed at easily
dankunpleasantly cool and humid
keck
dacesmall European freshwater fish with a slender bluish-green body

and
canairtight sealed metal container for food or drink or paint etc.
endeither extremity of something that has length
kenrange of what one can know or understand
acethe smallest whole number or a numeral representing this number
denthe habitation of wild animals
cadsomeone who is morally reprehensible
nae
aneused of a single unit or thing; not two or more
kealarge brownish-green New Zealand parrot
kae
dakEast Indian tree bearing a profusion of intense vermilion velvet-textured blooms and yielding a yellow dye

anan associate degree in nursing
dea Mid-Atlantic state; one of the original 13 colonies
edimpotence resulting from a man's inability to have or maintain an erection of his penis
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)
ada public promotion of some product or service
enhalf the width of an em
nea colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts
kaunknown god; an epithet of Prajapati and Brahma
ae

KNACKED