commemorative

As an adjective commemorative

is .

As a noun anniversary is

of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event.

As adjectives the difference between commemorative and memorative

is that commemorative is serving to commemorate, e.g., a person or event while memorative is commemorative.

As a noun commemorative

is an object made to commemorate a person, mark an event, etc.