What is the difference between Use case and Use case model? [closed]

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I'm delivering a project to a client and he is asking for Use case and use case model What is the difference between them ?

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A Use case is a description of a single interaction between the user and the system. A Use case model is a description of a whole functionality described with many use cases.

For example, if a system needs to manage some invoice related business process, then a use case model for such a process would consist of a use case describing steps required to add an invoice to the system, another use case describing what the user should do to sign it, and another use case presenting an invoice export scenario - etc..