Is DILLS a Wordle Word?

Yes. DILLS 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 DILLS mean?

/dɪlz/

Anethum graveolens (the type species of the genus Anethum), a herb, the seeds of which are moderately warming, pungent, and aromatic, formerly used as a soothing medicine for children; also known as dillseed.
A cucumber pickled with dill flavoring
A fool.

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

Starter word rating: WeakIn the top 80% of all valid Wordle words for testing common letters.
Vowels: I
Unique letters: 4 of 5Repeats L
Common letters: I, L

Hard-mode trap: 19 valid words fit the pattern _ILLS. 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.