Will fill out the password in the morning, but for now:
'Africa, South' is right for #2.
Menelluin is not right. Nor is Eowyn.
The colour connections proposed by Pervinca are spot on. Tolkien specifies yellow irises in a letter.
For the purposes of this password, the rainbow should be read as red-orange-yellow-green-blue-purple-pink.
(Because indigo is an invention of Isaac "Numerology" Newton. I mean, my colour blindness means I don't believe in purple either, but Tolkien used it, so I shall allow it.)
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