substitutability

noun

sub·​sti·​tut·​abil·​i·​ty ˌsəbztəˌtütəˈbilətē 

-bst-, 

-tə‧ˌtyü-, 

-ütə-, 

-lətē, 

-i

: capacity for being substituted : the quality or state of being substitutable

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