Early Quenya
hyar
noun. plough
hyar-
verb. to plough
hyarma
noun. plough
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 noun appearing as ᴱQ. hyar (hyarm-) “a plough” in the Qenya Lexicon of the 1910s under the early root ᴱ√HYAŘA [HYAÐA] “plough through” (QL/41). In the contemporaneous Poetic and Mythological Words of Eldarissa it appeared only as its stem form hyarm- “plough” (PME/41). Early Qenya Word-lists of the 1920s had ᴱQ. hyarma “a plough” (PE16/144).
Neo-Quenya: The form hyarma conflict with the later word Q. hyarma “left hand”. However, since the later root ᴹ√SYAD had a similar meaning “shear through, cleave” in The Etymologies of the 1930s (Ety/SYAD), I think ᴺQ. hyar “plough” can be salvaged for purposes of Neo-Quenya derived from a primitive form like ✱syadĕ.