Is BALKS a Wordle Word?

Yes. BALKS 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 BALKS mean?

An uncultivated ridge formed in the open field system, caused by the action of ploughing.
The wall of earth at the edge of an excavation.
Beam, crossbeam; squared timber; a tie beam of a house, stretching from wall to wall, especially when laid so as to form a loft, "the balks".

7 more noun definitions

A hindrance or disappointment; a check.
A sudden and obstinate stop; a failure.
An omission.
A deceptive motion; a feint.
The area of the table lying behind the line from which the cue ball is initially shot, and from which a ball in hand must be played.
The area of the table lying behind the baulk line.
The rope by which fishing nets are fastened together.

7 more verb definitions

To indicate to fishermen, by shouts or signals from shore, the direction taken by the shoals of herring.

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

Starter word rating: WeakIn the top 58% of all valid Wordle words for testing common letters.
Vowels: A
Unique letters: 5 of 5
Common letters: A, L

Hard-mode trap: 8 valid words fit the pattern BA_KS. 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.