approbatory vs affirmative

approbatory is not a noun while affirmative is a noun.

Word	Noun	Adjective	Verb	Adverb
approbatory	No	Yes	No	No
affirmative	Yes	Yes	No	No

As adjectives, approbatory and affirmative are synonyms defined as:

approbatory and affirmative: expressing or manifesting praise or approval

Other synonyms of approbatory include approbative, approving, plausive.

approbatory (noun)	affirmative (noun)
	a reply of affirmation

approbatory (adjective)	affirmative (adjective)
expressing or manifesting praise or approval	affirming or giving assent
	expressing or manifesting praise or approval
	expecting the best