Is SUCKS a Wordle Word?

Yes. SUCKS 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 SUCKS mean?

/sʌks/

An instance of drawing something into one's mouth by inhaling.
Milk drawn from the breast.
A weak, self-pitying person; a person who refuses to go along with others, especially out of spite; a crybaby or sore loser.

3 more noun definitions

To use the mouth and lips to pull in (a liquid, especially milk from the breast).
To perform such an action; to feed from a breast or teat.
To put the mouth or lips to (a breast, a mother etc.) to draw in milk.

5 more verb definitions

To extract, draw in (a substance) from or out of something.
To work the lips and tongue on (an object) to extract moisture or nourishment; to absorb (something) in the mouth.
To pull (something) in a given direction, especially without direct contact.
To perform fellatio.
To be inferior or objectionable: a general term of disparagement, sometimes used with at to indicate a particular area of deficiency.

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

Starter word rating: WeakIn the top 97% of all valid Wordle words for testing common letters.
Vowels: U
Unique letters: 4 of 5Repeats S

Hard-mode trap: 13 valid words fit the pattern _UCKS. 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.