From Wiki -
Oracle Fusion (Middleware) consists of several software products from Oracle Corporation. OFM spans multiple services, including Java EE and developer tools, integration services, business intelligence, collaboration, and content management. OFM depends on open standards such as BPEL, SOAP, XML and JMS. strictly speaking Oracle ADF is a component of the Oracle Fusion which provides a commercial Java framework for building enterprise applications. (It provides visual and declarative approaches to Java EE development. It supports rapid application development based on ready-to-use design patterns, metadata-driven and visual tools.)
So in short there is no point of differentiating between these two as one is the service/component of another.