The misspelled word in the sentence is "ware".
What is a misspelled word?
When a word is misspelled, it means that the letters were used incorrectly or were arranged incorrectly. Example, the word kitchen spelled incorrectly as "citchen."
In the sentence, "The old garden bench is showing much ware after 20 years in the weather.", "ware" word is spelled incorrectly as it should have been "wear" which means erode or damage which fits according to the meaning of the sentence.
Thus, "ware" is a misspelled word in the sentence.
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