Definition of substitutes:
(v) :
(transitive) To use in place of something else, with the same function.
(v) :
(transitive, in the phrase "substitute X for Y") To use X in place of Y.
(n) :
A replacement or stand-in for something that achieves a similar result or purpose.
(v) :
(intransitive) To serve as a replacement (for someone or something).
(v) :
(transitive, sports) To remove (a player) from the field of play and bring on another in his place.
(n) :
A substitute teacher.