“HOLLOWLY” is a valid word. — 17 points Scrabble

hollowa cavity or space in something
whollyto a complete degree or to the full or entire extent (`whole' is often used informally for `wholly')
woollyhaving a fluffy character or appearance

hollyany tree or shrub of the genus Ilex having red berries and shiny evergreen leaves with prickly edges
lowlylow or inferior in station or quality
lollyinformal terms for money
woolyhaving a fluffy character or appearance
holloa very loud utterance (like the sound of an animal)
hooly

how
whoa United Nations agency to coordinate international health activities and to help governments improve health services
whythe cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores'
oohexpress admiration and pleasure by uttering `ooh' or `aah'
lowan air mass of lower pressure; often brings precipitation
wooseek someone's favor
owlnocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes
looa toilet in Britain
yow
hoya flatbottom boat for carrying heavy loads (especially on canals)
oho

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

HOLLOWLY