Here is the full solution for CraftConnections Day 20. Each group is shown with its difficulty colour and a redundant shape, so it stays readable if you are colour blind.
Classic — Day 20
● Dyes White Dye · Magenta Dye · Light Gray Dye · Green Dye
▲ Blocks that hold your stuff Barrel · Smoker · Dispenser · Furnace
◆ Crafted with string Loom · Fishing Rod · Scaffolding · Bow
★ Only found in the End End Rod · Dragon's Breath · Shulker Shell · Dragon Egg
No-overlap — Day 20
● Swords Iron Sword · Stone Sword · Copper Sword · Golden Sword