adjective
1. (of words) interchangeable in a given context without changing the import of the expression
• Similar to: ↑synonymous
2. capable of being exchanged for another or for something else that is equivalent
• Syn: ↑commutable
• Similar to: ↑exchangeable
• Derivationally related forms: ↑substitutability, ↑commutability (for: ↑commutable)
Useful english dictionary. 2012.