Is CURBS a Wordle Word?

Yes. CURBS 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 CURBS mean?

A concrete margin along the edge of a road; a kerb (UK, Australia, New Zealand)
A raised margin along the edge of something, such as a well or the eye of a dome, as a strengthening.
Something that checks or restrains; a restraint.

3 more noun definitions

A riding or driving bit for a horse that has rein action which amplifies the pressure in the mouth by leverage advantage placing pressure on the poll via the crown piece of the bridle and chin groove via a curb chain.
A sidewalk, covered or partially enclosed, bordering the airport terminal road system with adjacent paved areas to permit vehicles to off-load or load passengers.
A swelling on the back part of the hind leg of a horse, just behind the lowest part of the hock joint, generally causing lameness.

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

Starter word rating: WeakIn the top 59% of all valid Wordle words for testing common letters.
Vowels: U
Unique letters: 5 of 5
Common letters: R

Hard-mode trap: 7 valid words fit the pattern CUR_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.