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).
A root appearing in some late notes on verbs from around 1969, with the sense “possess, own, keep” (PE22/151). It seems to be a restoration of a much earlier root from the 1910s, which appeared as ᴱ√AW̯A in the Qenya Lexicon with derivatives having to do with wealth, such as ᴱQ. ausie “wealth” and ᴱQ. aute “rich” (QL/33), as well as Gnomish and Early Noldorin cognates G. avos “wealth” (GL/20) and ᴱN. awes “rich” (PE13/137). This root is a good example of how certain linguistic ideas could lay dormant for many years in Tolkien’s writing, only to reemerge much later. This makes it difficult to say for certain whether Tolkien really abandoned a particular idea.