An unglossed root in the Qenya Lexicon of the 1910s whose derivatives had to do with tickling such ᴱQ. kitya- “tickle” and ᴱQ. kityalea “ticklish, susceptible, sensitive” (QL/47). The contemporaneous Gnomish Lexicon contained a couple of possible Gnomish cognates: G. tisc “ticklish” and G. tisca- “tickle” (GL/70). This kind of k/t variation is seen in a few other early Qenya and Gnomish forms, such as ᴱQ. talqe “glass” vs. G. celc (QL/88; GL/25) and probably represents variant roots in ancient Elvish.

I think it is worth preserving this root for purposes of Neo-Eldarin, but the only way I see to preserve a similar k/t variation in the phonetic systems of later Quenya and Sindarin is to posit a root inversion to √TIK in the Sindarin branch, as in the inversion of the CE root √LED’s to √DEL in Quenya (WJ/363).