Deputise
Part of speech: verb
Definition: To make (someone) a deputy; to officially empower.
Substitute
Part of speech: noun
Definition: A replacement or stand-in for something that achieves a similar result or purpose.A player who is available to replace another if the need arises, and who may or may not actually do so.
Part of speech: verb
Definition: To use in place of something else, with the same function.In the phrase "substitute X for Y", to use X in place of Y.In the phrase "substitute X with/by Y", to use Y in place of X.To remove (a player) from the field of play and bring on another in his place.To serve as a replacement (for someone or something)
Example sentence: There's simply no substitute for experience in terms of aviation safety.