in·ter·change·a·ble 
(ĭn′tər-chānjə-bəl)
(ĭn′tər-chānjə-bəl)adj.
Capable of being interchanged: interchangeable items of clothing; interchangeable automotive parts.
in′ter·change′a·bili·ty, in′ter·changea·ble·ness n.
in′ter·changea·bly adv.