1.
Hippopotomonstrosesquippedaliophobia
2.
Pneumonoultramicroscopicsilicovolcanoconiosis
3.
Supercalifragilisticexpialidocious
4.
Floccinaucinihilipilification
5.
lakeChargoggagoggmanchauggagoggchaubunagungamaugg
7.
Antidisestablishmentarianism
11.
Dichlorodifluoromethane
12.
Honorificabilitudinitatibus
13.
Pseudopseudohypoparathyroidism
14.
Deinstitutionalization
18.
Laryngotracheobronchitis
19.
Thyroparathyroidectomized