Middle Primitive Elvish
leb
root. stay, stick, adhere, remain, tarry
lem
root. stay, stick, adhere, remain, tarry
lepen
root. five
lep(e)ne
noun. five
lepek
root. five
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 root in The Etymologies of the 1930s glossed “stay, stick, adhere, remain, tarry”, with variants ᴹ√LEB and ᴹ√LEM (Ety/LEM), but some of its derivatives can only plausibly be derived from ᴹ√LEM: ᴹQ. lemya- “to remain, tarry” (EtyAC/LEB). Its most notable derivative was Q. Lembi “Lingerers”, but Tolkien’s seems to have abandoned this word and the root may have been abandoned with it. It nevertheless remains useful for the purposes of Neo-Eldarin.