Could you give us exactly what you are seeing? I just did a quick google translate (which is really not a great source) and "because" gets ため、から、なぜなら、為、だって、なぜならば、だけに、etc... The reason that you got so many different translations is because these are used in different grammar structures. If you tried to translate a noun, you would probably get fewer translations. It's true that there are different words that mean the same thing though. Japanese has synonyms. Like any language, you just have to practice using them and figure out which word works best for a certain situation.