A noun appearing as {lûg “a worm, serpent” >>} G. lûgi “a wind, a twist” in the Gnomish Lexicon of the 1910s with an extended meaning “guile, deceit” (GL/55), clearly based on the early root ᴱ√LOKO “twine, twist, curl” (QL/55). For its deleted meaning, see the later word S. lhûg “reptile, snake, worm” (PE17/160).
Neo-Sindarin: Since the later meaning of the √LOK “bend, loop” is fairly close to its early meaning, I would update this word to ᴺS. lûg “bend, loop, wind, twist; guile, deceit” for purposes of Neo-Sindarin, with added glosses “bend, loop” to be closer to the later meaning of its root √LOK “bend, loop”. I would still assume lûg has the alternate meaning “guile, deceit” as an extension of its basic sense.
An adjective appearing as G. guin “own, held, possessed” in the Gnomish Lexicon of the 1910s, above another entry G. guig “a piece of property”, with a brace indicating the two entries had been combined (GL/43). It was likely based on gui the past form of G. gôtha- “possess, have, hold” (GL/42).
Neo-Sindarin: For purposes of Neo-Sindarin, I would update this adjective to ᴺS. garnen “owned, held, possessed” as the passive participle of N. gar- “hold, have” from The Etymologies of the 1930s derived from the root ᴹ√GAR (Ety/GAR). Compare N. garn “property” from the same root.