The plural form "Wörter" means literally only words, like in a list, they don't form a sentence or have any meaning if put together. That's why "Wörterbuch" means "Dictionary". In a dictionary you have tons of words in alphabetical order, but that's it. Whereas "Worte" means the words have a meaning and a context; when someone is asked "Could you please say a few words?" in front of an audience you would say "Können Sie bitte ein paar Worte sagen?", because those words are supposed to have meaning! If you ask someone "Können Sie bitte ein paar Wörter sagen?", he or she will litteraly ennumerate some words without further meaning!