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

hallo
alohaan acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian)
hollaa very loud utterance (like the sound of an animal)
halal

hallan interior passage or corridor onto which rooms open
haloan indication of radiant light drawn around the head of a saint
ollaleaf or strip from a leaf of the talipot palm used in India for writing paper

allquantifier; used with either mass or count nouns to indicate the whole number or amount of or every one of a class
aahexpress admiration and pleasure by uttering `ooh' or `aah'
aha
hao10 hao equal 1 dong in Vietnam
alaa flat wing-shaped process or winglike part of an organism
aal

oha midwestern state in north central United States in the Great Lakes region
ah
ha(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
laa white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
hoa trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
ala silvery ductile metallic element found primarily in bauxite
lo
aaa dry form of lava resembling clinkers

HALLOA