Is SETER a Wordle Word?

Yes. SETER is a valid Wordle word.

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

What does SETER mean?

Alternative spelling of saeter: A Scandinavian mountainside meadow used during the summer for grazing milking cows or goats.“Every summer, a long long time ago, they went up to the seter with the cows from Melbustad, in Hadeland.”
A natural terrace in solid rock, formed by waves, that marks the former position of a shoreline.
A silk scarf or thin pice of cotton cloth used to consecrate a domestic animal to a deity in Mongolia.“As I entered her house early on the afternoon before the ritual, Nadmid Udgan was busy making protective amulets (seter, lusyn örgöl) on her manual sewing machine.”

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

Starter word rating: AverageIn the top 22% of all valid Wordle words for testing common letters.
Vowels: E
Unique letters: 4 of 5Repeats E
Common letters: E, T, R

Hard-mode trap: 7 valid words fit the pattern SE_ER. 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.