What is the longest word you can type using only the top row of the keyboard?

PROPRIETORY, PROTEROTYPE, RUPTUREWORT, PITUITOTROPE, UROPYOURETER.

https://www.quora.com/What-is-the-longest-word-we-can-write-using-only-the-top-row-of-letters-from-a-keyboard

OED acknowledges Proprietory (albeit with a reference to Proprietary for all three definitions). UK citations too.

Question #55699. tankz asks:
What is the longest word you can compose using only the top row of letters of a keyboard (qwerty format), i.e. using the letters QWERTYUIOP?

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peasypod posts:

Peasy wasn't around when #27831 appeared but had she had been there she would have posted "UROPYOURETER" meaning 'a collection of urine and pus in the ureter.'

Mar 06 05, 4:37 PM