Replaceability and Interchangeability

replaceability

Exchangeability by virtue of being replaceable.
- synonyms: substitutability, commutability

(n.) The quality, state or degree of being replaceable.

Webster's Revised Unabridged Dictionary

interchangeability

The quality of being capable of exchange or interchange.
- synonyms: exchangeability, interchangeableness, fungibility

(n.) The state or quality of being interchangeable; interchangeableness.

Webster's Revised Unabridged Dictionary