tolkienlanguages1-5  Exercise 1: Plurals and the Genitive
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  atan  -> atani    ends in a consonant: add -i
  elda  -> eldar    ends in a vowel: add -r
  aiwë  -> aiwi     ends in -ë: change -ë to -i

  ango     "of iron"    anga (iron) + genitive -o (final -a becomes -o)
  mindono  "of a tower" mindon (tower) + genitive -o

The genitive -o says "of": it does the work of the English word.