Is FILLS a Wordle Word?

Yes. FILLS 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 FILLS mean?

/fɪlz/

8 more verb definitions

To become full.“the bucket filled with rain; the sails fill with wind”
To become pervaded with something.“My heart filled with joy.”
To satisfy or obey (an order, request or requirement).“The pharmacist filled my prescription for penicillin.”
To install someone, or be installed, in (a position or office), eliminating a vacancy.“Sorry, no more applicants. The position has been filled.”
To treat (a tooth) by adding a dental filling to it.“Dr. Smith filled Jim's cavity with silver amalgam.”
To fill or supply fully with food; to feed; to satisfy.
To trim (a yard) so that the wind blows on the after side of the sails.
(of a male) To have sexual intercourse with (a female).“Did you fill that girl last night?”

(after a possessive) A sufficient or more than sufficient amount.“Don't feed him any more: he's had his fill.”
An amount that fills a container.“The mixer returned to the plant for another fill.”
The filling of a container or area.“That machine can do 20 fills a minute.”

4 more noun definitions

Inexpensive material used to occupy empty spaces, especially in construction.“The ruins of earlier buildings were used as fill for more recent construction.”
Soil and/or human-created debris discovered within a cavity or cut in the layers and exposed by excavation; fill soil.
An embankment, as in railroad construction, to fill a hollow or ravine; also, the place which is to be filled.
A short passage, riff, or rhythmic sound that helps to keep the listener's attention during a break between the phrases of a melody.“bass fill”

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: I
Unique letters: 4 of 5Repeats L
Common letters: I, L

Hard-mode trap: 19 valid words fit the pattern _ILLS. 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.