coron (1) noun "mound" (SA); Coron Oiolairë ("Koron"), place-name: the "Mound of Eversummer" where the Two Trees grew. Also contracted Corollairë (WJ:401) and Corlairë (MR:107); both are spelt with an initial k in the sources.
Quenya
coron
noun. mound, mound; [ᴹQ.] globe, ball
coron
mound
coron
globe, ball
coron (2) ("k") (corn-, as in dat. sg. cornen) noun "globe, ball" (KOR)
coron oiolairë
place name. Mound Ever-summer
A fuller name of Corollairë, a combination of coron “mound”, oi(o) “ever” and lairë “summer” (WJ/401).
cumbë
mound, heap
cumbë ("k")noun "mound, heap" (KUB)
A word glossed “mound” in the name Koron Oiolaire “Mound Ever-summer” in the Quendi and Eldar essay from 1959-60, also an element in Corollairë “Green Mound” from The Silmarillion (WJ/401; S/38; SA/coron). In The Etymologies of the 1930s, however, ᴹQ. koron was glossed “globe, ball” and was derived from the root ᴹ√KOR “round” (Ety/KOR). If “globe” is its primary meaning, then perhaps it could also refer to round hills as hemispheres.
In The Etymologies, its stem form was korn- as indicated by its (Middle Quenya) genitive kornen, likely the result of the Quenya syncope. The same reduction in inflected forms may apply to the later version of the word as well.