Is NIVAL a Wordle Word?

Yes. NIVAL is a valid Wordle word.

It is not on the Wordle answer list, so it is unlikely to be a daily answer.

What does NIVAL mean?

Abounding with snow; snowy; snow-covered (now especially in reference to plant habitats).
Found or thriving in snowy conditions.

Definition from Wiktionary, available under the CC BY-SA license.

Starter word rating: AverageIn the top 40% of all valid Wordle words for testing common letters.
Vowels: I, A
Unique letters: 5 of 5
Common letters: I, A, L

Letter ratings use how often each letter appears in Wordle answers.

Tap its tiles to the colours Wordle showed, and the Wordle Solver lists every word that still fits, with the best next guess.