mitigation vs palliation

mitigation and palliation both are nouns.

Word	Noun	Adjective	Verb	Adverb
mitigation	Yes	No	No	No
palliation	Yes	No	No	No

As nouns, mitigation and palliation are synonyms defined as:

mitigation and palliation: to act in such a way as to cause an offense to seem less serious

Other synonyms of mitigation include extenuation.

mitigation (noun)	palliation (noun)
to act in such a way as to cause an offense to seem less serious	easing the severity of a pain or a disease without removing the cause
the action of lessening in severity or intensity	to act in such a way as to cause an offense to seem less serious
a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances