different between reminder vs reminding

English

remind +? -er

reminder (plural reminders)

Someone or something that reminds.
He left a note as a reminder to get groceries.
(finance) Writing that reminds of open payments.
She ignored first the reminder of 80 cents. At the end, she was sentenced to pay 200 euros!

reminding

reminding (plural remindings)

The act by which somebody is reminded of something.
- 1991, Program of the Thirteenth Annual Conference of the Cognitive Science Society
  This paper explores the relationship between human activity and remindings. We argue that the type of activity in which a person is engaged influences the kinds of features that trigger remindings […]

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