palliation vs mitigation

palliation and mitigation both are nouns.

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

As nouns, palliation and mitigation are synonyms defined as:

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

Other synonyms of palliation include extenuation.

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