Through the course of education. Also, you can find many in the dictionary. My personal favorite is Mirriam-Webster's New Collegiate. Lots of nifty words in that one.
Pneumonoultramicroscopicsilicovolcanoconiosis I love that word. It is 'a lung disease caused by the inhalation of very fine silica dust, causing inflammation in the lungs.' The word sounds cool and stupid simultaneously.
You better be sure these are real words and you are not making up proof of what they are. If you want you can make a link to the word so the n I know the word is real.
ooh, cyanocobalamin. That's another fun one to say. It's a synthetic version of vitamin B-12. Zyzzyva is another good one. Zyzzyva is a type of beetle. It's unique as a word in that it is typically the very last word found in a dictionary.
