Want to create a word bank for Spanish words? All you need is a box such as a shoe box or other box, a pair of scissors, and paper. Collect words you have recently learned and write them on paper. Cut them up and put them in the box. You can inspect it monthly to see how many words you have learned.
You can also cut up words you see in a newspaper. Keep two columns titled, "words I know" and "words I don't know." Choose words you know and write them on paper. You can make it an activity to learn the words you don't know and eventually add them to the word bank.
Keep a tally of how many words you learn in a month. It will be exciting to see your progress each month.
Saving words will become a natural habit, and you will be surprised at how much you can really learn.