Is SHASH a Wordle Word?

Yes. SHASH is a valid Wordle word.

It is not on the Wordle answer list, so it is unlikely to be a daily answer.

What does SHASH mean?

/ʃæʃ/

The scarf of a turban.“So much for the ſilk in Judea called Sheſh in Hebrevv, vvhence haply, that fine linen or ſilk is called Shaſhes vvorn at this day about the heads of eaſtern people.”
A sash.
Synonym of snow (“random pattern of dots when there is no signal”).“Even productions designed for office or home video viewing usually need a title sequence to mark off the empty tape, hiss and shash from the prepared recording […]”

To produce white noise.“The machine shashed and crackled, broadcasting silence. Urgently the man repeated, 'Shearwater, Shearwater, Shearwater. This is Brewmarine. Keith speaking. Over. Over.' More shashing, more silence.”

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

Starter word rating: WeakIn the top 94% of all valid Wordle words for testing common letters.
Vowels: A
Unique letters: 3 of 5Repeats S, H
Common letters: A

Hard-mode trap: 6 valid words fit the pattern S_ASH. 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.