Middle Primitive Elvish
tun
root. *tall; mound
ton
root. tap, knock
khe
pronoun. they
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.
An unglossed root in The Etymologies of the mid-1930s with derivatives like ᴹQ. tunda/N. tonn “tall” and ᴹQ. tundo/N. tunn “hill, mound”; its most notable use was as the basis for the name ᴹQ. Túna (Ety/TUN), which continued to appear in later writings as the name of a hill (S/59). The word ᴹQ. lopotundo “rabbithole” from the Declension of Nouns of the early 1930s indicates the root may have had a difference sense (“hole”?) in earlier writings (PE21/10, 31).