Actually, neither of those words are the longest. Indeed, both have a number of prefixes and suffixes of technical natures that modify the root word.

The actual longest word without prefixes, suffixes, or modifiers is:

Floccinaucinihiliplificate.

To declare something to be useless trivia.

I enter into this contest
Radomirjordanovic
as the world'* longest word that'* shorter than other long words.