You have probably heard that learning a foreign language, especially one that shares a "parent language" (such as Latin) with English, can build your vocabulary exponentially - in both languages! Ask me about my list of almost 30 categories of cognates, from which you can easily learn hundreds of words that are almost identical in English and Spanish.
Because I love words - word games/puzzles, languages, translating, wordsmithing, etc., I subscribe to a daily email list containing an unusual English word and its definition. Recently, the word of the day was "susurrus," an unfamiliar word. Thanks to my knowledge of the Spanish word, "susurrar" (to whisper), I immediately knew that "susurrus" means "whispering, murmuring, rustling."