Early Quenya
hya-
prefix. *their; 3rd pl. fem. possessive
hya-
prefix. *her; 3rd sg. fem. possessive
hyá-
verb. to stand
hya
pronoun. this by us
hya
preposition. by
sia-
prefix. *their; 3rd pl. fem. possessive
var
conjunction. or
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 preposition for “by” in the Qenya Lexicon of the 1910s under the early root ᴱ√HYA “this by us” (QL/41).