Statistics for Longest English Word in any major English language dictionary

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Longest Word	% Correct
p	100%
pn	81%
pne	81%
pneu	81%
pneum	81%
pneumo	81%
pneumon	81%
pneumono	81%
pneumonou	77%
pneumonoul	74%
pneumonoult	74%
pneumonoultr	74%
pneumonoultra	74%
pneumonoultram	74%
pneumonoultrami	74%
pneumonoultramic	74%
pneumonoultramicr	74%
pneumonoultramicro	74%
pneumonoultramicros	74%
pneumonoultramicrosc	74%
pneumonoultramicrosco	74%
pneumonoultramicroscop	74%
pneumonoultramicroscopi	74%
pneumonoultramicroscopic	74%
pneumonoultramicroscopics	74%
pneumonoultramicroscopicsi	71%
pneumonoultramicroscopicsil	65%
pneumonoultramicroscopicsili	65%
pneumonoultramicroscopicsilic	65%
pneumonoultramicroscopicsilico	61%
pneumonoultramicroscopicsilicov	58%
pneumonoultramicroscopicsilicovo	58%
pneumonoultramicroscopicsilicovol	58%
pneumonoultramicroscopicsilicovolc	58%
pneumonoultramicroscopicsilicovolca	58%
pneumonoultramicroscopicsilicovolcan	58%
pneumonoultramicroscopicsilicovolcano	58%
pneumonoultramicroscopicsilicovolcanoc	58%
pneumonoultramicroscopicsilicovolcanoco	58%
pneumonoultramicroscopicsilicovolcanocon	58%
pneumonoultramicroscopicsilicovolcanoconi	58%
pneumonoultramicroscopicsilicovolcanoconio	58%
pneumonoultramicroscopicsilicovolcanoconios	58%
pneumonoultramicroscopicsilicovolcanoconiosi	58%
pneumonoultramicroscopicsilicovolcanoconiosis	58%