Is NILAS a Wordle Word?

Yes. NILAS is a valid Wordle word.

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

Plurals ending in S are almost never chosen as Wordle answers.

What does NILAS mean?

Newly frozen sea ice in the form of a smooth sheet less than ten centimeters (four inches) thick.

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

Starter word rating: AverageIn the top 12% of all valid Wordle words for testing common letters.
Vowels: I, A
Unique letters: 5 of 5
Common letters: I, L, A

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.