If $\text{MASON}$ is coded as $\text{NBTPO}$, then how will $\text{WORLD}$ be written in that same coding system?

Let's study the relationship between the original word and its code by analyzing letter shifts:
* $\text{M}\stackrel{+1}{\to }\text{N}$
* $\text{A}\stackrel{+1}{\to }\text{B}$
* $\text{S}\stackrel{+1}{\to }\text{T}$
* $\text{O}\stackrel{+1}{\to }\text{P}$
* $\text{N}\stackrel{+1}{\to }\text{O}$

The pattern shifts every individual letter forward by exactly one position ($+1$) in the alphabetical order. Applying this identical rule to $\text{WORLD}$:

* $\text{W}\stackrel{+1}{\to }\text{X}$
* $\text{O}\stackrel{+1}{\to }\text{P}$
* $\text{R}\stackrel{+1}{\to }\text{S}$
* $\text{L}\stackrel{+1}{\to }\text{M}$
* $\text{D}\stackrel{+1}{\to }\text{E}$

Thus, the final code is $\text{XPSME}$.