An adjective meaning “soiled, dirty” derived from primitive ᴹ✶waʒrā [waɣrā] (Ety/WAƷ). This word underwent quite a few phonetic developments, as indicated below and as described by Helge Fauskanger (AL-Ilkorin/gôr).
Doriathrin
gwau
noun. wind
gôr
adjective. soiled, dirty
A noun meaning “wind” derived from the root ᴹ√WAW(A) (Ety/WĀ). Here the [[ilk|initial [w] became [gw]]], and after the final vowel vanished, the [[ilk|final [w] became [u]]].