ᴹ√KYAR root. “cause, do”
This root appeared in The Etymologies of the 1930s glossed “cause, do” as an etymological variant of ᴹ√KAR “make, build, construct”; its derivatives include ᴹQ. tyar- “cause” and ᴹQ. tyaro “doer, actor, agent” (Ety/KAR, KYAR). Tolkien’s continued use of Q. tyar- “cause” in his later writings (PE22/154; VT43/18) indicates its ongoing validity.
References ✧ Ety/KAR, KYAR