Early Primitive Elvish
qořo
root. *choke, suffocate, drown
qoso
root. *choke, suffocate, drown
qoðo Reconstructed
root. *choke, suffocate, drown
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 Qenya Lexicon of the 1910s given as ᴱ√QOŘO [QOÐO] having derivatives like ᴱQ. qoro- “choke, suffocate, drown” and ᴱQ. qonda “choking smog, smoke” (QL/78); it also had a variant form (probably a distinct root) ᴱ√QOSO from which ᴱQ. qosse “mist” was likely derived.
Neo-Eldarin: I think it worth positing a Neo-Eldarin root ᴺ√KWOD to preserve some of these Early Qenya words, but bear in mind there is strong evidence that the combination quo- was not possible in Tolkien later iterations of Quenya, as discussed in the entry for how [[q|[wo] became [o]]] in Quenya.