A noun “foam” in the Gnomish Lexicon of the 1910s with variants osp and ospa (GL/63), probably derived from the root ᴱ√Palas (QL/72).
Gnomish
gwing
noun. wave-crest, crest, foam
gwingli
noun. loom
gwingalos
proper name. Foamflower
gwingil
noun. foam maiden, mermaid
osp(a)
noun. foam
The Gnomish Lexicon of the 1910s had G. {gwindel, gwingl >>} gwingli and (archaic) †gwidhr for “loom” based the early root ᴱ√gu̯iđ (GL/46).
Neo-Sindarin: This early root fell out of use in Tolkien’s later writings. The Etymologies of the 1930s had ᴹQ. lanwa “loom” under the root ᴹ√LAN “weave” (Ety/LAN), so I’d coin a word ᴺS. lanu “loom” to replace the probably-abandoned Gnomish words.