Is WELTS a Wordle Word?

Yes. WELTS 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 WELTS mean?

A ridge or lump on the skin, as caused by a blow; a wheal or weal.
(shoemaking) A strip of leather set into the seam between the outsole of a shoe and the upper, through which these parts are joined by stitching or stapling.
A strip of material or covered cord applied to a seam or garment edge to strengthen or cover it.

5 more noun definitions

In steam boilers and sheet-iron work, a strip riveted upon the edges of plates that form a butt joint.
In carpentry, a strip of wood fastened over a flush seam or joint, or an angle, to strengthen it.
In machine-made stockings, a strip, or flap, of which the heel is formed.
A narrow border, as of an ordinary, but not extending around the ends.
A feature resembling a welt.

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

Starter word rating: AverageIn the top 21% of all valid Wordle words for testing common letters.
Vowels: E
Unique letters: 5 of 5
Common letters: E, L, T

Hard-mode trap: 10 valid words fit the pattern _ELTS. 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.