Level 529 - 4 Letters

Here's the 4 letter solution for Level 529 in 4 Pics 1 Word

4 pics 1 Word Level 529 Image 1 4 pics 1 Word Level 529 Image 2 4 pics 1 Word Level 529 Image 3 4 pics 1 Word Level 529 Image 4
C
U
B
E