Welcome @missilen.
Platform
in OpenMRS terminology refers to OpenMRS Core (project containing the API), whereas the Reference Application
is one of the distributions of OpenMRS.
As far as Reference Application
as a distribution is concerned, it consists of several other modules (bundled modules) working together to serve as EMR platform consuming the API implementation of OpenMRS Core
.
Note: You may find the details about Reference Application and various bundled modules here.