Middle Primitive Elvish
war
root. give way, yield, not endure, let down, betray
oktā
noun. strife, war
aya
root. other, different (of larger numbers)
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 (Noldorin only?) root in The Etymologies of the 1930s glossed “give way, yield, not endure, let down, betray” with derivatives like N. awarth “abandonment”, N. gwarth “betrayer”, and N. gweria- “betray” (Ety/WAR). Tolkien said it was the opposite of ᴹ√BOR “endure” (EtyAC/WAR) which had various Noldorin derivatives having to do with loyalty (Ety/BOR).