Is WHITS a Wordle Word?

Yes. WHITS 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 WHITS mean?

The smallest part or particle imaginable; an iota.“He worked tirelessly to collect and wind a ball of string eight feet around, and it matters not one whit.”

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

Starter word rating: WeakIn the top 67% of all valid Wordle words for testing common letters.
Vowels: I
Unique letters: 5 of 5
Common letters: I, T

Hard-mode trap: 10 valid words fit the pattern WHI_S. If you reach it, you may need several guesses to find the last letter.

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.