heap, piled mound
Noldorin
cum
noun. mound, heap, mound, heap, [G.] burial mound
cum
noun. mound, heap
cumb
noun. mound, heap
caun
adjective. empty, void
cofn
adjective. empty, void
haedh
noun. heap
haudh
noun. (burial) mound, grave, tomb
lhost
adjective. empty
lhost
adjective. empty
A noun in The Etymologies of the 1930s glossed “mound, heap” derived from the root ᴹ√KUB (Ety/KUB). The forms ᴱN. cum(b) “mound” and G. cûm “mound (especially grave), burial mound” appeared in Early Noldorin Word-lists of the 1920s (PE13/141) and Gnomish Lexicon of the 1910s (GL/27), but these earlier forms were probably derived from ᴱ√KUMU “heap up” (QL/49). This word appeared in the name N. Cûm-na-Dengin “Mound of Slain” in Silmarillion drafts from the 1930s (SM/312, LR/147) as well as its precursors in earlier versions of the tales, but later this name became S. Haudh-en-Ndengin.
Neo-Sindarin: For purposes of Neo-Sindarin, I’d avoid this word and use S. haudh. In later writings the root √KUB was given the new meaning “hide, secrete” (PE22/155).