palliative vs mitigative

palliative is a noun but mitigative is not a noun.

Word	Noun	Adjective	Verb	Adverb
palliative	Yes	Yes	No	No
mitigative	No	Yes	No	No

As adjectives, palliative and mitigative are synonyms defined as:

palliative and mitigative: moderating pain or sorrow by making it easier to bear

Other synonyms of palliative include alleviative, alleviatory, lenitive, mitigatory.

palliative (noun)	mitigative (noun)
remedy that alleviates pain without curing

palliative (adjective)	mitigative (adjective)
moderating pain or sorrow by making it easier to bear	moderating pain or sorrow by making it easier to bear