A reader: “As long as you’re asking about typewriter trivia: What
10-letter English word can be written entirely on the top row of a
typewriter keyboard? (I mean the top row with letters, of course.)”
Did you really think an old word buff like me wouldn’t know that?
“TYPEWRITER,” of course.
You will sometimes hear it said that this is the longest top-row-only word.
Not so: “RUPTUREWORT” is longer.