There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
kava-
verb. to dig
kav-
verb. to dig
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.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
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).