“COOLTH” is a valid word. — 11 points Scrabble

clothartifact made by weaving or felting or knitting or crocheting natural or synthetic fibers
cholo
cloot

coolthe quality of being at a refreshingly low temperature
toolan implement used in the practice of a vocation
holt
colta young male horse under the age of four
lootgoods or money obtained illegally
clota lump of material formed from the content of a liquid
hoota loud raucous cry (as of an owl)
locoinformal or slang terms for mentally irregular
locha long narrow inlet of the sea in Scotland (especially when it is nearly landlocked)
cootslate-black slow-flying birds somewhat resembling ducks
cohofatty pinkish flesh of small salmon caught in the Pacific and Great Lakes
lothunwillingness to do something contrary to your custom

tooto a degree exceeding normal or proper limits
lot(often followed by `of') a large number or amount or extent
hotused of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning
oohexpress admiration and pleasure by uttering `ooh' or `aah'
looa toilet in Britain
cota sheath worn to protect a finger
coothe sound made by a pigeon
cola pass between mountain peaks
oot
thoa branch of the Tai languages
oho

to
oha midwestern state in north central United States in the Great Lakes region
hoa trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
lo

COOLTH