The longest word starting with a "P" is pneumonoultramicroscopicsilicovolcanoconiosis, which has 45 letters and is in the Guinness Book of Records. It was, however, coined for the specific purpose of becoming the longest word, and is not a specifically recognized form of silicosis.
Pnushsnsjserhjajajajajajjajaja
Pneumonoultramicroscopicsilicovolcanoconiosis (also happens to be the longest word in the English language)
The longest word starting with E is Electroencephalographically.
Scoop, Soup, and others, I'm not 100% sure about the rest though
Floccinaucinihilipilification is the longest word starting with F; it means the act of estimating something as worthless.
Extraterritoriality is the longest word in the English language beginning with "ex."
Pneumonoultramicroscopicsilicovolcanoconiosis (also happens to be the longest word in the English language)
The longest word starting with E is Electroencephalographically.
Scoop, Soup, and others, I'm not 100% sure about the rest though
Floccinaucinihilipilification is the longest word starting with F; it means the act of estimating something as worthless.
Youthfulness is the longest word starting with the letter Y. It contains twelve letters.
p-
Extraterritoriality is the longest word in the English language beginning with "ex."
Methionylthreonylthreonylglutaminylalanyl...isoleucine. It has 189819 letters and the longest word in the world.
pub
iufijifidafhudfhafa
enormous
forethoughtfulness