Is HULLS a Wordle Word?

Yes. HULLS 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 HULLS mean?

/hʌlz/

To remove the outer covering of a fruit or seed.“She sat on the back porch hulling peanuts.”

The body or frame of a vessel, such as a ship or plane.
(of a set A) The smallest set that possesses a particular property (such as convexity) and contains every point of A; slightly more formally, the intersection of all sets which possess the specified property and of which A is a subset.“The orthogonal convex hull of an orthogonal polygon is the smallest orthogonally convex polygon that encloses the original polygon.”

To drift; to be carried by the impetus of wind or water on the ship's hull alone, with sails furled.
To hit (a ship) in the hull with cannon fire etc.

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

Starter word rating: WeakIn the top 87% of all valid Wordle words for testing common letters.
Vowels: U
Unique letters: 4 of 5Repeats L
Common letters: L

Hard-mode trap: 12 valid words fit the pattern _ULLS. 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.