Sindarin 

dor-na-daerachas

place name. Land of Great Dread

A proposed replacement name for Dor Daedeloth that Tolkien made in very late notes from 1971 (WJ/187), translated “Land of Great Dread” (WJ/183). The first few elements seem to be dôr “land”, na(n) “of” and daer “great”. This means the final element achas (perhaps lented from ✱gachas) must mean “dread”, but there are no other clear equivalents to this word in Tolkien’s writing. In a Discord chat from 2022-10-17, Röandil proposed the first element might instead by dae (still meaning “great”), and that the second element rachas might be related to Q. raxë “danger”.

Elements

WordGloss
dôr“land, land, [N.] region where certain people live, [ᴱN.] country; [G.] people of the land”
na(n)“of; with, along with, accompanied by, provided with or by, associated with, marked with, of; provided with or by, associated with, marked with, with, along with, accompanied by; [N.] by”
daer“great, large”
?
Sindarin [WJ/187; WJI/Dor-na-Daerachas] Group: Eldamo. Published by