A noun for “thief” in the Qenya Lexicon of the 1910s, an agental formation based on ᴱQ. naqa- “steal” (QL/64).
Early Quenya
pilu
noun. thief, robber
pilukka
adjective. secret, stealthy
lomba
adjective. secret
naqar
noun. thief
pilmo
noun. thief, robber
A noun appearing as ᴱQ. pilu “thief, robber” in the Qenya Lexicon of the 1910s under the early root ᴱ√PILI “rob”, along with a longer variant pilmo (pilmu-) (QL/74).
Neo-Quenya: Since I retain ᴺQ. pil- “to steal, ✱rob” for purposes of Neo-Quenya, I would retain ᴺQ. pilu “thief, robber” as well. For example, this noun was used in Helge Fauskanger’s NQNT (NQNT). A later noun of similar meaning is Q. arpo “seizer, thief”.