alleviative vs lenitive

alleviative is not a noun while lenitive is a noun.

Word	Noun	Adjective	Verb	Adverb
alleviative	No	Yes	No	No
lenitive	Yes	Yes	No	No

As adjectives, alleviative and lenitive are synonyms defined as:

alleviative and lenitive: moderating pain or sorrow by making it easier to bear

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

alleviative (noun)	lenitive (noun)
	remedy that eases pain and discomfort

alleviative (adjective)	lenitive (adjective)
moderating pain or sorrow by making it easier to bear	moderating pain or sorrow by making it easier to bear