Is CHATS a Wordle Word?

Yes. CHATS 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 CHATS mean?

/tʃæts/

Any savory snack, sold from a roadside stall in India, or served as a starter in an Indian restaurant

Informal conversation.
A conversation to stop an argument or settle situations.
(totum pro parte, typically with definite article) The entirety of users in a chatroom or a single member thereof.“The Chat just made a joke about my skills.”

3 more noun definitions

An exchange of text or voice messages in real time through a computer network, resembling a face-to-face conversation.
Any of various small Old World passerine birds in the muscicapid tribe Saxicolini or subfamily Saxicolinae that feed on insects.
Any of several small Australian honeyeaters in the genus Epthianura.

To be engaged in informal conversation.“I like to chat over a coffee with a friend.”
To talk more than a few words.“I met my old friend in the street, so we chatted for a while.”
To talk of; to discuss.“They chatted politics for a while.”

1 more verb definition

To exchange text or voice messages in real time through a computer network, as if having a face-to-face conversation.“Do you want to chat online later?”

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

Starter word rating: AverageIn the top 31% of all valid Wordle words for testing common letters.
Vowels: A
Unique letters: 5 of 5
Common letters: A, T

Hard-mode trap: 11 valid words fit the pattern CHA_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.