Qenya
ruk-
verb. to pluck
rauko
noun. demon
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.
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 verb from the Quenya Verbal System (QVS) of 1948 based on the root ᴹ√RUK “pluck” (PE22/102).
Neo-Quenya: Elsewhere √RUK was the basis for demon words like S. Balrog, so for “pluck” I would use ᴱQ. lep- which is more obviously connected to fingers.