1) Replacement 2) Substitute 
substitute; remedy
• (n.) One who, or that which, succeeds to the place of another; that which is used for something else; a substitute • (n.) a remedy used as a substitute for another.
Suc`ce·da'ne·um noun ; plural Succedanea . [ New Latin See Succedaneous .] One who, or that which, succeeds to the place of another; that which is used for something else; a substitute ; specifically (Medicine) , a remedy used as a substitute for another. « In lieu o...
Type: Term Pronunciation: sŭk′sē-dā′nē-ŭm Definitions: 1. A substitute; a drug or any therapeutic agent that has the properties of and can be used in place of another.
[n] - something that can be used as a substitute (especially any medicine that may be taken in place of another)
noun (medicine) something that can be used as a substitute (especially any medicine that may be taken in place of another)
a substitute.