“HODADDY” is a valid word. — 16 points Scrabble

ahoy
dyadtwo items of the same kind
dadopanel forming the lower part of an interior wall when it is finished differently from the rest of the wall
hoyaany plant of the genus Hoya having fleshy leaves and usually nectariferous flowers
yodhthe 10th letter of the Hebrew alphabet

hadhave or possess, either in a concrete or an abstract sense
daytime for Earth to make a complete rotation on its axis
dadan informal term for a father; probably derived from baby talk
adda condition (mostly in boys) characterized by behavioral and learning disorders
oddnot divisible by two
yah
haygrass mowed and cured for use as fodder
dahthe longer of the two telegraphic signals used in Morse code
adoa rapid active commotion
hao10 hao equal 1 dong in Vietnam
hoya flatbottom boat for carrying heavy loads (especially on canals)
yod
hodan open box attached to a long pole handle; bricks or mortar are carried on the shoulder

doan uproarious party
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
ya
yo
hoa trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
ada public promotion of some product or service
ay
oy
oda doctor's degree in optometry

HODADDY