misuse (
http://definr.com/misuse)
n : improper or excessive use [syn:
abuse]
v 1: apply badly or incorrectly [syn:
misapply]
2: change the inherent purpose or function of something; "Don't
abuse the system"; "The director of the factory misused
the funds intended for the health care of his workers"
[syn:
pervert,
abuse]