OBL: ocean bill of lading means ocean bill of lading. (Of course, there are sometimes original bills of lading. )
OBL includes MBL and HBL.
HBL:house bill of lading, that is, nvocc bill of lading, a separate document.
MBL: master bill of lading, shipping company bill of lading, master bill of lading.
As can be seen from the definition, OBL includes HBL. In other words, HBL is an OBL.