There currently isn't a way to discover the mapping between ObjectType and the entity names.
Here is the list that I know off the top of my head. Is this what you are looking for?
ObjectType Entity Name Node Orion.Nodes Interface Orion.NPM.Interfaces Volume Orion.Volumes Group Orion.Groups
yes that is the way i follow. another Exapmle is
"APM: Component" - orion.apm.components