उत्तर (Reply means उत्तर or जवाब). Reaction means प्रतिक्रिया. Hence उत्तर will be more apt here.
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Abhishek,
Dec 22, 2021 at 12:04
Applied
प्रतिउत्तर , Reaction means प्रतिक्रिया, so प्रतिउत्तर is the right word, apt than उत्तर, because उत्तर is answer to a question, which is not awaited. However प्रतिउत्तर is awaited, i.e reply or response, awaited for a posted message.
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SRD FINANCIAL,
Dec 22, 2021 at 13:27
Applied
Replies means जवाब not प्रतिक्रिया, Response is प्रतिक्रिया