Is FACTS a Wordle Word?

Yes. FACTS 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 FACTS mean?

/fæks/

Something actual as opposed to invented.“In this story, the Gettysburg Address is a fact, but the rest is fiction.”
Something which is real.“Gravity is a fact, not a theory.”
Something concrete used as a basis for further interpretation.“Let's look at the facts of the case before deciding.”

6 more noun definitions

An objective consensus on a fundamental reality that has been agreed upon by a substantial number of experts.“There is no doubting the fact that the Earth orbits the Sun.”
Information about a particular subject, especially actual conditions and/or circumstances.“The facts about space travel.”
An individual value or measurement at the lowest level of granularity in a data warehouse.
Action; the realm of action.
A wrongful or criminal deed.“He had become an accessory after the fact.”
A feat or meritorious deed.

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

Starter word rating: WeakIn the top 43% of all valid Wordle words for testing common letters.
Vowels: A
Unique letters: 5 of 5
Common letters: A, T

Letter ratings use how often each letter appears in Wordle answers.

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