Modifiers matching roller:

• smooth,
• industrial,
• metallic,
• large,
• motorized,
• expensive,

Simple categories matching motorized:

• equipment,
• vehicle,
• implement,
• watercraft,
• host,
• part,
• thing,
• device,
• machine,
• unit,
• transport,
• item,
• vessel,
• toy,
• bike,
• tool,
• roller,
• boat,
• rv,
• blower,
• craft,
• appliance,
• cart,