Longest words used

1. supercalifragilisticexpialidocious: included in Oxford dictionary.

2. pneumonoultramicroscopicsilicovolcanoconiosis: included in Oxford dictionary. It means "a lung disease caused by the inhalation of very fine silica dust from volcanic eruption". Regarded by the Guiness Book of World Records as the longest made-up word.

3. floccinaucinihilipilification: It means "the estimation of something as valueless". The Guiness Book of World Records regards this as the "real" longest word in English language. But the Merriam Webster dictionary does not include this word because it believes the word is just a made-up example for a long word.

4. antidisestablishmentarianism: means "opposition to the disestablishment of the Church of England"

5. honorificabilitudinitatibus: invented by William Shapespeare in his play "Love's Labour's Lost"

6. tetramethyldiaminobenzhydrylphosphinous: a kind of acid

7. hepaticocholangiocholecystenterostomies: it is a surgical creation of a connection between the gall bladder and a hepatic duct and between the intestine and the gall bladder

8. formaldehydetetramethylamidofluorimum: a chemical compound.

9. dimethylamidophenyldimethylpyrazolone: a chemical compund

10. dichlorodiphenyltrichloroethane: long name for DDT, the poisonous chemical compound

11. Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch: It is a village in Wales, England.

12. Taumatawhakatang­ihangakoauauot­amateaturipukaka­pikimaunga­horonuku­pokaiwhenuak­itanatahu" is a name of a hill in New Zealand

13. Bababadalgharaghtakamminarronnkonnbronntonnerronntuonnthunntrovarrhounawnskawntoohoohoordenenthurnuk" used by James Joyce in novel Finnegans Wake, or Pepsi used "Lip­smackin­thirst­quenchin­acetastin­motivatin­good­buzzin­cool­talkin­high­walkin­fast­livin­ever­g