commemorative vs commemorating

commemorative is a noun but commemorating is not a noun.

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

As adjectives, commemorative and commemorating are synonyms defined as:

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

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