A word in the Qenya Lexicon of the 1910s glossed “dig” under the early root ᴱ√KAVA (QL/45). The verb form kav- reappeared in charts of Qenya Verb Forms from this same period, but there it was untranslated (PE14/28).
Early Quenya
sampe
noun. cave, hollow
sampo
noun. cave, hollow
kav-
verb. to dig
kava-
verb. to dig
orot
noun. cave
rótele
noun. cave
sap-
verb. to dig
sapa-
verb. to dig
A verb appearing as ᴱQ. sapa- “dig” in the Qenya Lexicon of the 1910s under the early root ᴱ√SAPA of the same basic meaning (QL/82). The verb ᴱQ. sap- “dig” reappeared in Early Qenya Word-lists of the 1920s (PE16/145).
Neo-Quenya: Since the root √SAP appeared in Tolkien’s later writing, I would retain ᴺQ. sap- “to dig” for purposes of Neo-Quenya.
A noun in the Qenya Lexicon of the 1910s glossed “cave, hollow” with variants sampe and sampo derived from the root ᴱ√SAPA “dig, excavate” (QL/82), both variants also appearing in the Poetic and Mythological Words of Eldarissa with the gloss “cave” (PME/82).