Middle Primitive Elvish
nas
root. point, sharp end
eʒ-
verb. to be
yē
root. to be
ē
root. to be
ī
root. to be
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 “point, sharp end”, with derivatives like ᴹQ. nasse “thorn, spike”, N. nass “point, (sharp) end; angle, corner” and ᴹQ. nasta-/N. nasta- “to prick” (Ety/NAS). It also had an s-prefixed variant ᴹ√SNAS or ᴹ√SNAT whose most notable derivative was N. naith “gore” (Ety/SNAS). Tolkien used the name S. Naith for the wedge of land in Lórien between the rivers Celebrant and Anduin in The Lord of the Rings (LotR/347).
The derivation of N. naith from ᴹ√SNAS/SNAT is unclear, however, and later on Tolkien gave a new etymology of this word from the root √NEK “narrow” (PE17/55; UT/282). This may mean Tolkien abandoned ᴹ√(S)NAS, but I think it is worth retaining ᴹ√NAS for purposes of Neo-Eldarin for words like nasta- “to prick”.