Middle Primitive Elvish
waʒ
root. stain, soil
wahsē
noun. stain
vag
root. stain, soil
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 “stain, soil” with derivatives like ᴹQ. vakse/N. gwass “stain” and ᴹQ. vára/N. gwaur “soiled, dirty” (Ety/WAƷ). Tolkien also gave it an alternate form ᴹ√VAG (EtyAC/WAƷ). The 1930s name N. Iarwath or Iarwaeth “Blood-stained” was based on this root (Ety/WAƷ, YAR; WJ/83). In the 1950s Tolkien change this name to S. Agarwaen (WJ/142), and the second element of this name (S. ✱gwaen) might still be based on ᴹ√WAƷ.