I need to override method in frappe.utils.money_in_words
in my custom app how ?
You can take a look at
https://frappeframework.com/docs/v14/user/en/python-api/hooks#override-doctype-class
https://frappeframework.com/docs/v14/user/en/python-api/hooks#override-whitelisted-methods
Have you override it?