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Most Sindarin plurals are formed by apophony and are characterised by i-mutation. The Noldorin term for this is prestanneth "affection of vowels". Here are a few exemples :

Sg. > Pl. (English translation)

galadh > gelaidh (tree - trees)
bereth > berith (queen - queens)
nogoth > negyth (Dwarf - Dwarves)
tulus > tylysy (poplar tree - poplar trees)
cant > caint (outline - outlines)
alph > eilph (swan - swans)
tâl > tail (foot - feet)
brannon > brennyn (lord - lords)
orod > ered (mountain - mountains)
thôn > thŷn (pine-tree - pine-trees)
urug > yryg (monster - monsters)
hû > hui (dog - dogs)

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