A rejected draft version of the Adûnaic name for Morgoth translated “Lord”, replaced by Arûn of the same meaning (SD/376). It is transparently a derivative of the Elvish root ᴹ√KHER, as suggested by Carl Hostetter and Patrick Wynn (AAD/18). A later form of this word, ✱khôr “lord”, may appears as an element in the name Adûnakhôr “Lord of the West”.
Primitive elvish
kher
root. possess, possess, [ᴹ√] rule, govern, [ᴱ√] have power
khēr
noun. lord, master
kheru-
verb. to lord it over, be master of, own
kherī
noun. lady
kherū
noun. lord, master
kherūnī
noun. lady
kheru
verb. lord it over, be master of, own
árātō
noun. lord
The basic root for rulership was √KHER for most of Tolkien’s life. The root appeared as ᴱ√HERE “rule, have power” in the Qenya Lexicon of the 1910s, and in this period already had the derivative ᴱQ. heru “lord” and ᴱQ. heri “lady” (QL/40), words that retained the same form and meaning throughout Tolkien’s life. Gnomish derivatives from this period include G. herma “protection, lordship, sway”, G. hermon “lord”, G. hîr “care, anxiety; heed”, and G. hiril “queen†, princess” (GL/49).
In The Etymologies of the 1930s these last two Gnomish words became N. hîr “master” and N. hiril “lady” as derivatives of ᴹ√KHER “rule, govern, possess”; the words ᴹQ. heru/ᴹQ. heri reappeared as well (Ety/KHER). All four of these words reappeared frequently in Tolkien’s later writing, though S. hîr was more typically glossed “lord” (PM/210; SD/129; VT41/9; Let/382; UT/318). The root √KHER itself reappeared in a 1954 letter to Naomi Mitchison with the gloss “possess” (Let/178).