Gnomish
cas
noun. head, skull
bail
noun. sheath, case, cover; pod
hant
noun. throw, cast; turn or move in games
corob
noun. skull
baith
noun. garment
bannoth
place name. Mandos
halthi
noun. sheath
naug
noun. dwarf
naugli
noun. dwarf
nauin
adjective. dwarf
nôl
noun. head
ontha
pronoun. his
A word appearing as G. corob “a skull” in the Gnomish Lexicon of the 1910s (GL/26), likely related to ᴱ√KORO “be round” (QL/48).
Neo-Sindarin: Since √KOR “round” survived in Tolkien’s later conception of the languages, I’d retain this word as ᴺS. corob “skull”, especially since other early “skull” words such as ᴱN. cas derived from ᴱ√KASA “head” were probably no longer viable since non-initial s generally vanished in Sindarin.