Here is the full solution for CraftConnections Day 48. Each group is shown with its difficulty colour and a redundant shape, so it stays readable if you are colour blind.
Classic — Day 48
● Shovels Diamond Shovel · Wooden Shovel · Iron Shovel · Golden Shovel
▲ Helmets Golden Helmet · Leather Cap · Netherite Helmet · Turtle Shell
◆ You mine these with a shovel Snow · Snow Block · Green Concrete Powder · Mud
★ You can feed these to a horse Golden Apple · Wheat Crops · Hay Bale · Enchanted Golden Apple