ᴹ√KUB¹ root. “*mound, heap”
An unglossed root in The Etymologies of the 1930s serving as the basis for ᴹQ. kumbe/N. cum “mound, heap” (Ety/KUB). It was undoubtably a later iteration of ᴱ√KUMU “heap up” from the Qenya Lexicon of the 1910s with similar derivatives in both Qenya and Gnomish (QL/49; GL/27). This earlier root also had derivatives having to do with “burden” such as ᴱQ. kumba “burdened, laden”, but based on Gnomish words like G. gûm “burden” and G. gumriol “burdensome” (GL/43), this was probably due to blending with an otherwise unattested root *ᴱ√GUMU.
These roots were the basis of G. Cûm a Gumlaith “Mound of the First Sorrow” which later became N. Cûm-na-Dengin “Mound of Slain” (SM/312, LR/147). Eventually this name became Haudh-en-Ndengin “Mound of the Slain”, indicating that ᴹ√KUB was abandoned for this purpose. Indeed, in later writings Tolkien instead gave √KUB as “hide, secrete” instead (PE22/155).
Reference ✧ Ety/KUB ✧ KUB
ᴱ√KUMU root. “heap up”
References ✧ GL/27; QL/49