commutation vs substitution

commutation and substitution both are nouns.

Word	Noun	Adjective	Verb	Adverb
commutation	Yes	No	No	No
substitution	Yes	No	No	No

As nouns, commutation and substitution are synonyms defined as:

commutation and substitution: the act of putting one thing or person in the place of another:

Other synonyms of commutation include exchange.

commutation (noun)	substitution (noun)
the travel of a commuter	the act of putting one thing or person in the place of another:
(law) the reduction in severity of a punishment imposed by law	an event in which one thing is substituted for another
the act of putting one thing or person in the place of another:
a warrant substituting a lesser punishment for a greater one