Eldamo : Ilkorin/Doriathrin : initial [ŋ], [ɣ] became [g]

Ilk. initial [ŋ], [ɣ] became [g]; [{ŋɣ}-] > [g-]

Ilk. initial [ŋ], [ɣ] became [g]; [{ŋɣ}-] > [g-]

These developments are clearly described on the Comparative Tables (PE19/19). In The Etymologies, there are no examples [ŋ-], but the examples for [ɣ-] are numerous (see below).

Conceptual Development: In later notes on the development of Beleriandic [Ilkorin] ʒ and ñ written around 1950, Tolkien first described the same changes as above, but then revised the development of initial [ɣ-] to become [h-] (PE18/103-4, note #148). There are no attested examples of this revised development, however, and Tolkien abandoned the Ilkorin/Beleriandic language soon after these notes were written.

References ✧ PE18/103-104

Variations

initial [ɣ] became [h] ✧ PE18/103 (Bel. initial [ɣ] became [h]); PE18/104 (Bel. initial [ɣ] became [h])
initial [ŋ] became [g] ✧ PE18/104 (Bel. initial [ŋ] became [g])

Phonetic Rule Elements

[ŋ-]	>	[g-]	✧ PE18/105 (ñ > ñg > g); PE18/105 (ñw > ñgw > gw); PE19/19 (ŋ- > g-); PE19/19 (ŋw- > gw-)
[ɣ-]	>	[g-]	✧ PE19/19 (ʒ- > g-); PE18/105 (ʒ > h)

Phonetic Rule Examples

ŋj- > gj-	ŋ- > g-	ᴹ✶ŋj- > Ilk. g-	✧ PE19/19
ɣanwa > ganwa	ɣ- > g-	ᴹ√ƷAN > Dor. ganu	✧ Ety/ƷAN
ɣaran > garan	ɣ- > g-	ᴹ√ƷAR > Dor. garan	✧ EtyAC/ƷAR
ɣarða > garða	ɣ- > g-	ᴹ√ƷAR > Dor. garth	✧ Ety/ƷAR
ɣarma > garma	ɣ- > g-	ᴹ√ƷARAM > Dor. garm	✧ Ety/ƷARAM
ɣarōn > garōn	ɣ- > g-	ᴹ√ƷAR > Dor. garon	✧ Ety/ƷAR
ɣelle > gelle	ɣ- > g-	ᴹ√ƷEL > Dor. gell	✧ Ety/ƷEL
ɣelwa > gelwa	ɣ- > g-	ᴹ√ƷEL > Dor. gelu	✧ Ety/ƷEL
ɣo > go	ɣ- > g-	ᴹ✶ʒo > Ilk. go	✧ Ety/WŌ