interchangeable in WordNet English dictionary

1. capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
   "interchangeable electric outlets" "interchangeable parts"
   exchangeable  interchangeable  similar  standardized  standardised 
   
2. (mathematics, logic) such that the arguments or roles can be interchanged
   "the arguments of the symmetric relation, `is a sister of,' are interchangeable"
   interchangeable