As such, there is no difference between these two terms, namely the weed eater and the weed whacker. The only variation is that the specific term is used more in certain areas as compared to another term. Take the term ‘weed eater† for instance; it is used in the US by more than 70% of the population. While the term 'weed whacker' has shown a record of being used seven to eight percent among the search terms in a place like the District of Columbia and Connecticut.