Here are three groups of four related items:
Group 1: Food Items
- Sauerkraut
- Mustard
- Brat
- Coconut
Group 2: Hairstyles
- Updo
- Bun
- Warrior (as in "warrior braid")
- (This group may lean more on styles rather than specific names; it may require a flexible approach to the term "warrior")
Group 3: Objects
- Chair
- Wallet
- Mountain (referring to the outdoors, but it can be viewed as a natural object, or metaphorical property)
- Tree