In a certain code language, O is written as R, R is written as A, A is written as I, I is written as N, N is written as E, E is written as P, P is written as T, C is written as M and L is written as L. How will PORCELAIN be written as in that language?

TRAMPLINE

Given; In a certain code language, O is written as R, R is written as A, A is written as I, I is written as N, N is written as E, E is written as P, P is written as T, C is written as M and L is written as L.

So,

Words  O  R  A  I  N  E  P  C  L

Codes  R  A  I   N  E  P  T  M  L

Thus, the code for PORCELAIN will be TRAMPLINE