Is REARS a Wordle Word?

Yes. REARS 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 REARS mean?

To bring up to maturity, as offspring; to educate; to instruct; to foster.
(said of people towards animals) To breed and raise.“The family has been rearing cattle for 200 years.”
To rise up on the hind legs“The horse was shocked, and thus reared.”

7 more verb definitions

(usually with "up") To get angry.
To rise high above, tower above.
To raise physically or metaphorically; to lift up; to cause to rise, to elevate.“The monster slowly reared its head.”
To construct by building; to set up“to rear defenses or houses”
To raise spiritually; to lift up; to elevate morally.
To lift and take up.
To rouse; to strip up.

To move; stir.
(of geese) To carve.“Rere that goose!”
(regional, obsolete) To revive, bring to life, quicken. (only in the phrase, to rear to life)“He healeth the blind and he reareth to life the dead.”

The back or hindmost part; that which is behind, or last on order; - opposed to front.
Specifically, the part of an army or fleet which comes last, or is stationed behind the rest.
The buttocks, a creature's bottom

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

Starter word rating: GoodIn the top 10% of all valid Wordle words for testing common letters.
Vowels: E, A
Unique letters: 4 of 5Repeats R
Common letters: R, E, A

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