Is MOONS a Wordle Word?

Yes. MOONS 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 MOONS mean?

(by extension of Moon) Any natural satellite of a planet.“That's no moon, you idiot... it's a space station!”
A month, particularly a lunar month.“They stayed with their aunt and uncle for many moons.”
A crescent-like outwork in a fortification.“The moons surrounding the city walls were built in the sixteenth century.”

3 more noun definitions

To display one's buttocks to, typically as a jest, insult, or protest.“It was ill-advised of Sam to moon the photographer during the shoot.”
(usually followed by over or after) To fuss over something adoringly; to be infatuated with someone.“Sarah mooned over Sam's photograph for months.”
To spend time idly, absent-mindedly.

4 more verb definitions

To expose to the rays of the Moon.
To adorn with moons or crescents.
(cryptocurrency) Of a coin or token: to rise in price rapidly.“It is impractical if a currency moons and plummets often.”
To shoot the moon.

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

Starter word rating: WeakIn the top 86% of all valid Wordle words for testing common letters.
Vowels: O
Unique letters: 4 of 5Repeats O
Common letters: O

Hard-mode trap: 12 valid words fit the pattern _OONS. 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.