Gnomish
taru
noun. cross; crossing
taru
adjective. horned
târ
noun. horn
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 word appearing as G. {taru, tarb >>} taru in the Gnomish Lexicon of the 1910s meaning either “cross” or “crossing” (GL/69), clearly the equivalent of ᴱQ. tarwe “cross, crucifix” under the early root ᴱ√TARA in the contemporaneous Qenya Lexicon (QL/89).
Neo-Sindarin: Since I retain ᴺQ. tarwë “cross, crucifix” for purposes of Neo-Quenya, I would retain ᴺS. taru for Neo-Sindarin as well, but only in the sense “cross, ✱crucifix”. For “crossing” I would use later words like athrad.