Power weeder and tiller

The primary difference between a power weeder and a power tiller is their horsepower:
Power weeder
A power weeder has less than 9 horsepower. It's a machine used in farming to remove weeds and prevent the soil's fertility from degrading. Power weeders can be powered by diesel or petrol engines and can be used for:
Ploughing soil
Removing weeds
Tilling and digging soil
Power tiller
A power tiller has more than 9 horsepower. It's a two-wheeled agricultural tool with rotating tillers that can be used for many purposes, including:
Tilling the ground
Ploughing
Sowing seeds
Planting seedlings
Adding fertilizer
Spraying fertilizer, herbicides, and water
Pumping water
Harvesting
Threshing