“YIPPIES” is a valid word. — 14 points Scrabble

pipea tube with a small bowl at one end; used for smoking tobacco
piesdish baked in pastry-lined pan often with a pastry top
pipsa disease of poultry
yipsnervous tension that causes an athlete to fail (especially causes golfers to miss short putts)
yipe
espycatch sight of
sipe
pepsliveliness and energy
pipy
pyes

yesan affirmative
yep
piedish baked in pastry-lined pan often with a pastry top
spy(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
sipa small drink
pepliveliness and energy
pipa disease of poultry
yipa sharp high-pitched cry (especially by a dog)
psia unit of pressure
sei
pis
pye
pesthe part of the leg of a human being below the ankle joint

ishave the quality of being; (copula, used with an adjective or a predicate noun)
ye
sia tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
esa radioactive transuranic element produced by bombarding plutonium with neutrons
pithe ratio of the circumference to the diameter of a circle; approximately equal to 3.14159265358979323846...
pethe 17th letter of the Hebrew alphabet

YIPPIES