Here are some examples of the longest words in English language:

1. Lopado­temacho­selacho­gameo­kranio­leipsano­drim­hypotrimmato­silphio­paraomelito­katakechymeno­kichl­e-

pi­kossypho­phatto­perister­alektryon­opte­kephallio­kinklo­peleio­lagoio­siraio­baphe­tragano­pterygon

is a fictional dish mentioned in Aristophanes'  comedy Assemblywomen. The original Greek spelling had 171 characters.

2. Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu

– 45 letters, the second longest place name in the world according to the Guiness Book of records, Longest Place Name in New Zealand, June 2006.

3. Pseudopseudohypoparathyroidism - 30 letters. This is an inherited disorder that closely simulates the symptoms,  thus it has mild or no manifestations of hypoparathyroidism or tetanic convulsions.

4. Floccinaucinihilipilification - 29 letters.

5.  Antidisestablishmentarianism - 28 letters.

6. Honorificabilitudinitatibus - 27 letters.

 And this is the Railway Station with the longest name in the world: