Question: what are 5 longest words?
Answer: Floccinaucinihilipilification (29 letters) ... 
Antidisestablishmentarianism (28 letters) ... 
Honorificabilitudinitatibus (27 letters) ... 
Thyroparathyroidectomized (25 letters) ... 
Dichlorodifluoromethane (23 letters) ... 
Incomprehensibilities (21 letters)