Question

Is ginger root or stem?With definition

Answer 1

a ginger is a stem also known as rhizome. a underground stem that stores food is called rhizome

Answer 2

Ginger is a hot, fragrant spice made from the rhizome of a plant, which may be chopped or powdered for cooking, preserved in syrup, or candied. 
Ginger is a stem .
Ginger root or simply ginger, is widely used as a spice or a folk medicine