Top 10 longest words

Antidisestablishmentarianism

28 Longest non-coined and nontechnical word[7]

Supercalifragilisticexpialidocious

34 Famous for being created for the Mary Poppins film and musical Coined

Pneumonoultramicroscopicsilicovolcanoconiosis

45 Longest word in a major dictionary[4] Technical; coined to be the longest word

Pseudopseudohypoparathyroidism

Longest non-coined word in a major dictionary[6] Technical

Floccinaucinihilipilification

Longest unchallenged nontechnical word Coined

Hippopotomonstrosesquipedaliophobia

Longest word ending in -phobia

Honorificabilitudinitatibus

Longest word in Shakespeare's works; longest word in the English language featuring alternating consonants and vowels.[8] Latin

Methionylthreonylthreonylglutaminylarginyl

isoleucine 189,819 Chemical name of titin, the largest known protein Technical; not in dictionary; disputed whether it is a word

Lopadotemachoselachogaleokranioleipsano

pterygon 182 Longest word coined by a major author,[2] the longest word ever to appear in literature.[3] Coined; not in dictionary; Ancient Greek transliteration

Methionylglutaminylarginyltyrosylglutamyl

serine 1,909 Longest published word[1] Technical