Is CAULS a Wordle Word?

Yes. CAULS 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 CAULS mean?

A style of close-fitting circular cap worn by women in the sixteenth century and later, often made of linen.
(often capitalized, used on maps) An entry to a mill lead taken from a burn or stream (a mill lead (or mill waterway) is generally smaller than a canal but moves a large volume of water).
A membrane.

5 more noun definitions

The thin membrane which covers the lower intestines; the omentum.
The amnion which encloses the foetus before birth, especially that part of it which sometimes shrouds a baby’s head at birth (traditionally considered to be good luck).
The surface of a press that makes contact with panel product, especially a removable plate or sheet.
A strip or block of wood used to distribute or direct clamping force.
Caul fat.

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

Starter word rating: AverageIn the top 27% of all valid Wordle words for testing common letters.
Vowels: A, U
Unique letters: 5 of 5
Common letters: A, L

Hard-mode trap: 6 valid words fit the pattern _AULS. 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.