Focal (Word):
innéacs

Roinn chainte (Part of speech): ainmfhocal (noun)
Inscne (Gender): firinscneach (masculine)
Leibhéal (Level): ardleibhéal (advanced)
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Brí (Meaning):
"an index"
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Fuaimniú (Pronunciation):
https://www.teanglann.ie/en/fuaim/inn%C3%A9acs

Foghraíocht (Phonetics):
/iN´e:ks/ (GC)
/iN´æks/ (GU)
/in´e:əks/ (GM)

Fónaic (Phonics):
IN-yehks (GC)
IN-yaks (GU)
in-EH-uks (GM)

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This is a portion of the Focal an Lae (Word of the Day) that I do on my Patreon page. The Patreon version includes declensions of nouns and adjectives and conjugations of verbs, examples of the word in use, related words, confusable words and notes on usage and what to watch out for.
I will be posting a basic Focal an Lae (Word of the Day) here for free every day. The full version is available to subscribers on Patreon.

https://www.patreon.com/collection/175184

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WARNING: Intermediate speaker - await further opinions, corrections and adjustments before acting on my advice.
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

And a slender nn is normally ng in Cork Irish, but there are words where it isn't, and I think a foreign borrowing would be word likely not to have ng. Inniu is pronounced iniubh, without the ng. So yes, I think the pronunciation is as given above, as if inéacs.