A grocery store, or supermarket, is a place you go to buy all the food you need. Grocery stores also sell other things that aren't food, like toilet paper, diapers, soap and lots of other things you use around the house.
The ground is the part of the world you stand on. When you talk about the ground, you usually mean the ground outside. Ground is usually made from dirt and often has grass growing on it.
Ground is also the past tense of grind.
Grout is a substance made of water, cement and sand that is used to fill up gaps between hard construction materials like tiles. Grout often contains coloring agents, and can be bought in a huge range of colors.
