Are you looking for words with complicated spelling?
Here are very long words for the difficult level of the spelling bee competition:
Honorificabilitudinitatibus
Supercalifragilisticexpialidocious
Antidisestablishmentarianism
Floccinoccinihilipilification
Pneumonoultramicroscopicsilicovolcanoconiosis
If you want to know more, just click this link:
(Is the title of my blog grammatically correct? I think it isn't. A superlative adjective cannot describe a plural noun. On the second thought aren't there exemptions?)