A noun in The Etymologies of the 1930s glossed “soil” derived from the root ᴹ√KEM “soil, earth” (Ety/KEM). It had a rather unusual plural form ceif which shows i-intrusion but not the usual i-raising of e to i; under ordinary phonetic developments the expected plural would be *cif. I can think of no good reason for this abnormal plural, but it would be ^caif if adapted to Sindarin. It is mostly moot since this word is very unlikely to be used in the plural.

A noun in the Gnomish Lexicon of the 1910s glossed “soil”, a combination of G. groth “earth, soil” and suffixal G. -gen from the root ᴱ√KEME (GL/42). This root was glossed “soil” in the contemporaneous Qenya Lexicon (QL/46), so the actual meaning of this word seems to be something like “earthy soil”.

A noun in the Gnomish Lexicon of the 1910s glossed “earth, soil” (GL/42). Its derivation is unclear, but it might be from a strengthened form of the root ᴱ√ROTO “hollow”.