Definitions of thatch:

• noun:   a house roof made with a plant material (as straw)
• noun:   hair resembling thatched roofing material
• noun:   plant stalks used as roofing material
• noun:   an English pirate who operated in the Caribbean and off the Atlantic coast of North America (died in 1718)
• verb:   cover with thatch

  Example: "Thatch the roofs"

• name:  A surname (very rare: popularity rank in the U.S.: #19925)