Is LUFFS a Wordle Word?

Yes. LUFFS 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 LUFFS mean?

The vertical edge of a sail that is closest to the direction of the wind.“By easing the halyard, the luff of the sail was made to sag to leeward.”
The act of sailing a ship close to the wind.
The roundest part of a ship's bow.

1 more noun definition

The forward or weather leech of a sail, especially of the jib, spanker, and other fore-and-aft sails.

(of a sail) To shake due to being trimmed improperly.
(of a boat) To alter course to windward so that the sails luff. (Alternatively luff up)
To let out (a sail) so that it luffs.

1 more verb definition

To alter the vertical angle of the jib of a crane so as to bring it level with the load.

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

Starter word rating: WeakIn the top 93% of all valid Wordle words for testing common letters.
Vowels: U
Unique letters: 4 of 5Repeats F
Common letters: L

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