A noun for “a pebble” in the Gnomish Lexicon of the 1910s, apparently a diminutive of G. cloch “a stone” (GL/26).
Gnomish
sard
noun. table
clocthi
noun. pebble
clog
noun. stone (small)
sirp
noun. straw
A word appearing as G. sirp “straw” in the Gnomish Lexicon of the 1910s related to G. thripthon “stem” (GL/36, 73). It is likely a cognate of ᴱQ. sirpe “stem, stalk” and hence derived from the early root ᴱ√SIRIPI (QL/84).
Neo-Sindarin: For purposes of Neo-Eldarin, I update this early root to ᴺ√THIRIP, so I would adapt this Gnomish was as ᴺS. thirph “straw” for purposes of Neo-Sindarin.
A noun appearing as G. sard “table” in the Gnomish Lexicon of the 1910s, which Tolkien compared to G. thrad “plank” (GL/67, 73). It was likely based on the early root ᴱ√SARA from the contemporaneous Qenya Lexicon having to do with sawing and sawed things like planks (QL/82). However, elsewhere in Gnomish Lexicon Tolkien had G. thar- “ to saw (up)” indicating a variant or revised root ᴱ√ÞARA (GL/72).
Neo-Sindarin: For purposes of Neo-Sindarin, I would assume the verbal sense of thar- “to saw” might still be viable as related to the later root √THAR “✱across” (referring to a sawing motion). From this I would adapt the Gnomish word for “table” as ᴺS. sardh, where the final rd became rdh as with words like gardh, and the initial s is due to dissimilation of th away from the final spirant dh; compare to úsaeth a deleted variant of úthaes (VT44/30).