I don’t think that’s part of the public API, so not possible without using the monday UI.

The exact call in the browser sends the equivalent of this curl:

curl 'https://myslug.monday.com/boards/1234' \\

  -X 'PUT' \\

  -H 'X-CSRF-Token: *****' \\

  ...

  -H 'Accept: application/json, text/javascript, */*; q=0.01' \\

  -H 'Content-Type: application/json' \\

  -H 'X-SOURCE-PRODUCT-KIND: core' \\

  --data-raw '{"pulse_nickname":{"preset_type":"other","singular":"My custom name","plural":"My custom names"},"caller":"set-pulse-nickname-component"}'  

Also, asking “Ask AI” I get:

Is there a way to Change item terminology using graphql?

I’m sorry, but the knowledge sources do not contain any information about changing the item terminology (nickname for items on a board) using GraphQL or the monday.com API. The item_terminology field is available as a read-only field when querying board details, but there is no documented mutation or API method to update it programmatically Api-reference > Reference > Boards}(Boards).

If you need to change the item terminology, you will likely need to do so manually through the monday.com web interface.