The Collaborative International Dictionary
Mortgageor
Mortgageor \Mort"gage*or\, Mortgagor \Mort"ga*gor\, n. (Law) One who gives a mortgage.
Note: The letter e is required analogically after the second g in order to soften it; but the spelling mortgagor is in fact the prevailing form. When the word is contradistinguished from mortgagee it is accented on the last syllable (-j[^o]r").
Wiktionary
mortgageor
n. (dated form of mortgager English)