This is my easy attempt at translating "nature spirit". Not quite it, although it could be. The spirit of nature.

How would that be then: nature spirt / nature spirits?

Or is there another word, coming from a more Irish mythological context that might be better?

Thanks for any help.

I'm not sure what you're trying to say in English, to be honest.

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A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.

er … I'm not sure if I understand what you mean by "The spirit of nature".

Are you asking about fairies?

sióg – fairy
na sióga – the fairies

Or you can also say:
síofra – fairy
na síofraí – the fairies

There is also:
púca (singular) púcaí (plural) – a kind of supernatural spirit (sometimes synonymous with fairies)

A more polite way to refer to them would be:
na daoine maithe – the good people

I hope this helps …

spiorad an nádúir = the ghost of nature

nádúir genitive of nádúr.

But that's a rather philosophic term not much connected with "nature ghosts", b'fhéidir: taibhsí an nádúir? But whereelse than in nature?

A dúil is "a natural being or element"

Na Dúile "The Elements, Nature"
An Dúlra "The Elements, Nature"

And then you have biotáille, which are also "natural" spirits, e.g. uisce bheatha, etc.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
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Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).