A name appearing only in The Etymologies from the 1930s glossed “Peaks of Iron” (Ety/AYAK), probably a variant name of Ered-engrin “Iron Mountains” using the plural of oegas “mountain peak” instead of orod “mountain”.
Noldorin
oeg
adjective. sharp, pointed, piercing
oegas
noun. mountain peak
oeges engrin
place name. Peaks of Iron
oeglir
noun. range of mountain peaks
oegas
noun. mountain peak
oeglir
noun. range of mountain peaks
menniath
noun. many points
menniath
noun. range of mountains
orod
noun. mountain
orod
noun. mountain
orodrim
noun. range of mountains
The noun N. oegas “mountain peak” appeared in The Etymologies as a noun form of oeg “sharp, pointed, piercing” (Ety/AYAK). In Noldorin, often ancient ai became oe, whereas in Sindarin ai fairly consistently became ae. Thus if adapting this word to Sindarin, its form would likely be ᴺS. aegas, as suggested in Hiswelókë’s Sindarin Dictionary (HSD/aegas).