What happens if customer is subscrbed to Cloud Fusion HCM & ERP and terminates the HCM Subscription?

Summary: Are there any guides or white papers that help evaluate the impact to ERP services & products if the current HCM subscription is terminated in favor of using another Human Resource Package?

Content (required): We would be looking for something that references what functionality and/or attributes would be lost or no longer available when an HCM subscription is discontinued but still used to support the current ERP implementation.

Also, what would this unsubscribed version of HCM be called - is it "Core HR" or "Core HCM"?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):