An Ilkorin noun for “head” attested only as an element in the name Dolmed “Wet Head” (Ety/MIZD, NDOL). It might also appear in Dol Dúghol, assuming that name is Ilkorin. Assuming it functions similarly to its Noldorin equivalent N. dôl, it can probably also be used to refer to a hill.
Doriathrin
dol dúghol
place name. Dol Dúghol
dolmed
place name. Wet Head
dol Reconstructed
noun. head, *hill
thuringwethil
feminine name. (Woman of) Secret Shadow
An earlier name for Dol Guldur appearing in Lord of the Rings drafts from the 1940s (WR/122), with variations Dol Dúgol (TI/178) and Dol Dûghul (TI/244). The word dûghol appears an earlier rejected word for “sorcery” in The Etymologies (EtyAC/ÑGOL), so perhaps this word was originally intended to be Ilkorin.