Is LOPER a Wordle Word?

Yes. LOPER is a valid Wordle word.

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

What does LOPER mean?

One who or that which lopes; a runner; a leaper.“Wolves are very intelligent animals, and they are lopers and they are survivors.”
A swivel placed at one end of the ropewalk, with the whirl being at the opposite end.
A wolf, especially a grey or timber wolf.

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

Starter word rating: GoodIn the top 6% of all valid Wordle words for testing common letters.
Vowels: O, E
Unique letters: 5 of 5
Common letters: L, O, E, R

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