Longest words I know
Lopadotemachoselachogaleokranioleipsanodrimhypotrimmatosilphioparaomelitokatakechymenokichlepikossyphoph-
attoperisteralektryonoptekephalliokigklopeleiolagoiosiraiobaphetraganopterygon
Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu
Pneumonoultramicroscopicsilicovolcanoconiosis
Pseudopseudohypoparathyroidism
Floccinaucinihilipilification