Context! "Des" can be "of the" in some contexts and it can be the plural partitive article in others (as it is here). As a partitive article, "des" represents the plural of "un" or "une". There is no plural partitive article in English but sometimes, if it makes for a more natural English expression, "des" may be translated as "some" but it is often simply omitted (in English, never in French).
"Un mot" is literally "a word" as a unit of language, whereas "parole" refers to "word/words" in a more general way: e.g., tenir parole (to keep one's word), perdre la parole (to lose the ability to speak), la parole divine (the holy word), les parole de chanson (the song lyrics). There is much more, but this will give you the idea. Source: Oxford French Dictionary.