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singular /plural
Faeries is that the same as fairies if so = síóg / síóga
or "na daoiní beaga" (the little people)
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Witches - many different words, Bean Sí is a particular one who haunts certain families before a member of the family dies. If there were a plural it 'd be mná sí. Other witches - cailleach / cailleacha or ??
but isn't the bean sí a kind of fairy or sthg like that? To me a witch is a woman (a living one) that practices witchcraft, while a fairy and the bean sí are kinds of spirits, ie. paranormal beings
I think there's a word like "bandraíodóir" as "witch" in the dictionaries; I think "cailleach" is mainly "old witch"

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Werewolf (or any other 'were' animal) - We have a werepoodle here
conriocht in the dictionary...
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Nymphs = not in Ireland afaik, not really sure what they are.
http://en.wikipedia.org/wiki/NymphThey are Greek

I think they'd be called síóg in Irish, ie. same word as fairies.
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Mermaids = Maighdean mhara
in the plural: maighdeana mara