Qenya
samna
noun. wooden post
samna
noun. diphthong
okamna
noun. diphthong
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 noun appearing as {sauna >>} samna in The Etymologies of the 1930s glossed “wooden post”, apparently derived from ᴹ✶stabnē under the root ᴹ√STAB based on its Old Noldorin cognate ON. stabne > sthamne, though it is not clear how the final e became a in the Quenya word (Ety/STAB; EtyAC/STAB).