Is LIARS a Wordle Word?

Yes. LIARS 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 LIARS mean?

One who tells lies.
A swabber responsible for cleaning the outside parts of the ship rather than the cabins, a role traditionally assigned to a person caught telling a lie the previous week.

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

Starter word rating: GoodIn the top 4% of all valid Wordle words for testing common letters.
Vowels: I, A
Unique letters: 5 of 5
Common letters: L, I, A, R

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.