A verb glossed “shatter” in the Gnomish Lexicon of the 1910s (GL/64), perhaps based on the early root ᴱ√RAKA “pile up”, though the meaning doesn’t match (QL/78).
Gnomish
ractha
noun. breach
ractha-
verb. to shatter
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A noun appearing as G. ractha “breach” in the Gnomish Lexicon of the 1910s, related to the verb G. rag- “break asunder, burst” (GL/64).
Neo-Sindarin: Since I retain ᴺS. rag- “to break (asunder), burst”, I would keep this noun as well, but I would update it to ᴺS. raeth “breach, ✱burst” to better fit Sindarin phonology.