Level 519 - 4 Letters

Here's the 4 letter solution for Level 519 in 4 Pics 1 Word

4 pics 1 Word Level 519 Image 1 4 pics 1 Word Level 519 Image 2 4 pics 1 Word Level 519 Image 3 4 pics 1 Word Level 519 Image 4
B
U
R
N