unexchangeable vs incommutable

unexchangeable and incommutable both are adjectives.

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

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