commemorating vs commemorative

commemorating is not a noun while commemorative is a noun.

Word	Noun	Adjective	Verb	Adverb
commemorating	No	Yes	No	No
commemorative	Yes	Yes	No	No

As adjectives, commemorating and commemorative are synonyms defined as:

commemorating (noun)	commemorative (noun)
	an object (such as a coin or postage stamp) made to mark an event or honor a person

commemorating (adjective)	commemorative (adjective)
intended as a commemoration	intended as a commemoration