Hippopotomonstrosesquipedaliophobia

Fear of long words?

Here are some others:

antidisestablishmentarianisms
dichlorodiphenyltrichloroethanes
electrocardiographically
electroencephalographically
ethylenediaminetetraacetates
floccinaucinihilipilifications
honorificabilitudinities
hydrochlorofluorocarbons
immunoelectrophoretically
intercomprehensibilities
microelectrophoretically
microspectrophotometries
overintellectualizations
phosphatidylethanolamines
pneumonoultramicroscopicsilicovolcanoconiosis
polytetrafluoroethylenes
psychoneuroimmunologists
transubstantiationalists

Afraid yet?