substitutable
subs·ti·tu·table
adjective
1.
(of words) interchangeable in a given context without changing the import of the expression
2.
capable of being exchanged for another or for something else that is equivalent
Origin
From substitute + -able.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.