incommutable vs unexchangeable

incommutable and unexchangeable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
incommutable	No	Yes	No	No
unexchangeable	No	Yes	No	No

incommutable (adjective)	unexchangeable (adjective)
not subject to alteration or change	not suitable to be exchanged
not interchangeable or able to substitute one for another	used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value