interchangeable

1. not comparableFreely substitutable; that may be swapped at will.

   Eli Whitney's development of interchangeable parts was a breakthrough for modern manufacturing. Prior to that, each part had to be made custom.

   3 more examples

   Constructional features of the railbus include the use of rubber suspension for axlebox/underframe and underframe/body mountings, the use of B.U.T. power transmission equipment, many components of which are interchangeable with those on British Railways standard railcars, power-operated sliding doors, and an absence of normal sidebuffers or drawgear.

   1958 April 28, “Diesel Railbus for British Railways”, in Railway Magazine, page 275

   Sometimes the same words mean opposite things. Sometimes the opposite is true. Shock absorbers are called shocks. Slow down and slow up are interchangeable.

   1997, George Carlin, Brain Droppings, New York: Hyperion Books, →ISBN, →LCCN, →OCLC, →OL, page 104

   The English, until relatively recently, seem to have imagined “English” and “British” to be interchangeable, as if Britain was just a bigger England.

   2014 September 16, Ian Jack, “Is this the end of Britishness”, in The Guardian

   Synonyms: equivalent

2. not comparableFollowing each other in alternate succession; alternating.

plural interchangeables

1. Anything that can be interchanged; a substitute.