Is TALCS a Wordle Word?

Yes. TALCS 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 TALCS mean?

/tælks/

Originally a large range of transparent or glistening foliated minerals. Examples include mica, selenite and the hydrated magnesium silicate that the term talc generally has referred to in modern times (see below). Also an item made of such a mineral and depending for its function on the special nature of the mineral (see next). Mediaeval writers adopted the term from the Arabic.
A microscope slide made of a plate of mica, generally in use from the start of modern microscopy until the early nineteenth century, after which glass slides became the standard medium.
A soft mineral, composed of hydrated magnesium silicate, that has a soapy feel and a greenish, whitish, or grayish color, and usually occurs in foliated masses.

1 more noun definition

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

Starter word rating: AverageIn the top 16% of all valid Wordle words for testing common letters.
Vowels: A
Unique letters: 5 of 5
Common letters: T, A, L

Hard-mode trap: 6 valid words fit the pattern TAL_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.