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.
símen
adverb. here
símen
adverb. *aiming at this
símane
adverb. here
nan úye sére indo-ninya símen, ullume
but my heart resteth not here for ever
sie
pronoun. here
sinis(se)
adverb. here
sinome
adverb. here
sis
adverb. here
sisse
pronoun. here
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 correlative appearing in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/108), a combination of ᴹQ. si “this” and ᴹQ. men- “aim”.