Is DUCKS a Wordle Word?

Yes. DUCKS 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 DUCKS mean?

/dʌks/

To quickly lower the head or body in order to prevent it from being struck by something.
To quickly lower (the head) in order to prevent it from being struck by something.
To lower (something) into water; to thrust or plunge under liquid and suddenly withdraw.

5 more verb definitions

To go under the surface of water and immediately reappear; to plunge one's head into water or other liquid.
To bow.
To evade doing something.
To lower the volume of (a sound) so that other sounds in the mix can be heard more clearly.
To enter a place for a short moment.“I'm just going to duck into the loo for a minute, can you hold my bag?”

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

Starter word rating: WeakIn the top 88% of all valid Wordle words for testing common letters.
Vowels: U
Unique letters: 5 of 5

Hard-mode trap: 13 valid words fit the pattern _UCKS. 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.