"horsepower" - key terms from Wikipedia

boiler horsepower
brake horsepower
crank horsepower
drawbar horsepower
effective horsepower
electrical horsepower
engine horsepower
gross horsepower
horsepower
horsepower	per cubic inch
horsepower	rating
horsepower	ratings
indicated horsepower
mechanical horsepower
metric horsepower
net horsepower
nominal horsepower
sae net horsepower
shaft horsepower
tax horsepower
taxable horsepower
wheel horsepower