I found a round-about way to do it. Turn off Predictive Text. Then go to your text messages and create a new message; type in all of the words you want to add to your 'dictionary' so-to-speak.(I typed my words in in both capital and non capital form so that I could choose which version I wanted if it was at the beginning of a sentence or not) and send the message to yourself.
Then go back and turn Predictive Text on, and turn on the setting to Learn From Messages (by clicking Predictive Text and check "Personalized Data" -->Learn From Messages". As long as you have that setting turned on, once you turn Predictive Text back on, it will scan your text and pick up the new words.
Works like a charm, the words you typed in will all be available now. You can do it each time you need to add new words. Not too big of a PITA, only takes a couple of minutes and once you get all your words in you won't have to fool with it anymore. And it prevents you from being forced to use the Swype keyboard to have personalized words!
....and actually I don't think you even have to turn Predictive text on and off each time, it looks like once you text yourself new words, you can just go to the settings under Predictive text (by clicking on Predictive Text) and hit "Learn From Messages" again and it will scan again for new words and update. I just tried that too and it seemed to work as well.