Ilkorin for “mother” (Ety/AM¹), also appearing in its plural form emnin (EtyAC/AM¹).
Doriathrin
-en Reconstructed
suffix. adjectival suffix
aman
noun. mother
el
noun. star
A Doriathrin noun meaning “star”, a simple derivative of the root ᴹ√EL (Ety/EL).
galbreth
noun. beech
gôl
noun. light
A (rejected?) Doriathrin noun for “light” derived from primitive ᴹ✶gālæ appearing in The Etymologies (Ety/KAL, EtyAC/KAL). According to Christopher Tolkien’s notes, it was part of a rejected etymology for the name Thingol, but it isn’t clear whether this noun was rejected or if it was just the etymology. Its long primitive vowel [[ilk|[ā] became [ō]]] as was the norm in Ilkorin.
neldor
noun. beech
A Doriathrin noun for “beech (tree)”, properly referring to Hirilorn with a true meaning of “three trunks” (Ety/NEL). Tolkien indicated it was a combination of neld “three” and orn “tree”, though it is unclear why the final -n vanished. He marked this derivation with a “?” perhaps because of this uncertainty.
Conceptual Development: Tolkien seems to have coined this word to explain names like Neldoreth. Its most obvious precursor is ᴱQ. neldor (QL/65).
An adjectival suffix appearing as both -en and -in, and in one place as -on: Brithon. The -en form can be easily explained as a derivative of the primitive suffix ᴹ✶-ina, with the [[ilk|primitive [i] becoming [e] due to Ilkorin a-affection]], the same origin as the Noldorin adjectival suffix -en. The -in variant is more difficult to explain. At least one example lómen had variations with both -en and -in, so perhaps the two forms represented vacillation on the function of Ilkorin a-affection, or an alternate primitive form ᴹ✶-ină where the final ă was lost before a-affection.
Alternately, -in could be a Doriathrin-specific variant, since the forms where it appears are all Doriathrin, while the forms where -en appear are marked Ilkorin, excepting only lómen which was itself revised from lómin.