About mortgage, charge, pledge:
The meanings varied from state to state, but generally a mortgage was an encumbrance on real estate, a charge was an encumbrance on someone's accounts receivable, a pledge was an emcumbrance on a movable object that the lender kept possession of (like a pawn shop)...and there were several others.

So it used to be necessary to have this long list in a document. Now these terms have all been subsumed by the term "security interest" but some of the older language remains.

ook:
"As Slade J has expressed the distinction: a mortgage involves a conveyance of the mortgaged property to the mortgagee subject to the mortgagor’s equity of redemption, whereas a charge makes no such conveyance and grants contingent rights over the property in the event that the underlying obligation is not performed."