[Urwen]

Originally Posted by Galadriel55

Still can't see the password. ERNIL comes up vertically, but it's one letter short. NIENOR can vaguely be seen diagonally, but there's a jump between the N and O.

Oh! But wait! If you align all the words against the RIGHT side, then Nienor fits perfectly!

MAEGLIN: A confused basque mineral meets a confused heath plant for a traitor
ADRAHIL: Reversed world meets a shortened hill for a Gondorian
DUNHERE: A dune with a cut-off tail in this place for him
THINGOL: Slim meets a reversed piece of wood for him
GOLLUM: Initially, giant octopus lay low under mill for the guide
RADBUG: Cool insect for an orc

That's it exactly. I tried to find the answers that would match against the left side, but couldn't find any, so I decided to go with the right side. T'is my big sis indeed.

As for mea bit, well, mea means mineral in basque, hence basque mineral.