anstataŭi

Etymology
From.

Verb

 * 1)  take the place of, be a substitute for, replace, supplant, stand in for

Usage notes
Not to be confused with anstataŭigi “replace, put something or someone in the place of another.” Compare:
 * Mielo anstataŭas sukeron “Honey is a substitute for sugar.”
 * Mi anstataŭigas sukeron per mielo “I replace sugar with honey.”