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Waes hail, Cailín!
In answer to the original question, referring specifically to LotR, I would say Elbereth is your best bet when it comes to absolute good.
She is (I am fairly sure) the only Vala featured in the trilogy, except for a passing reference to Orome. And while we are not told much about her, her name drives away evil, and makes those who call upon her feel wholesome.
I would also say the light of Earendil (via Frodo's phial) has the power of good. If we were to broaden the reference to the Silmarillion, the source of this light, the Silmarils, are so holy that they burn that which is impure. So perhaps they too embody absolute good.
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Out went the candle, and we were left darkling
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