Is NIXED a Wordle Word?

Yes. NIXED is a valid Wordle word.

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

Past-tense words ending in ED are almost never chosen as Wordle answers.

What does NIXED mean?

To make something become nothing; to reject or cancel.“Nix the last order – the customer walked out.”
To destroy or eradicate.

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

Starter word rating: WeakIn the top 57% of all valid Wordle words for testing common letters.
Vowels: I, E
Unique letters: 5 of 5
Common letters: I, E
Rare letters: X

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.