Did You Know: TYPEWRITER is the Longest Word That can be Made in the English Language Using the Letters From Only One Row of the Keyboard?
TYPEWRITER can be typed using only the top row of keys on the keyboard. The following ten-letter words with this feature all appear in W2: PEPPERROOT, PEPPERWORT, PERPETUITY, PEWTERWORT, PIROUETTER, PREREQUIRE, PRETORTURE, PROPRIETOR, REPERTOIRE, REPETITORY, TETTERWORT.
These words have also been suggested: PROPRIETORY, PROTEROTYPE, RUPTUREWORT, PITUITOTROPE, UROPYOURETER.
Chris Cole (Wordplay) gives TEETERTOTTER, although MWCD10 spells the word with a hyphen. A person who rides a teetertotter would be a TEETERTOTTERER [Stuart Kidd]. A reader of this page suggests POWERTRIPPER, although this word seems not to be in dictionaries.
EUROPE and PERU can be typed using only the top row of keys; Europe is the only continent that can be typed using a single row of letters.