In music production, a kick typically refers to a percussive sound, usually a drum - while the bass is the part of the music that provides the low-end rumble. The main difference between kick and bass is that kicks are generally more sharp and punchy, while basses tend to be deeper and more sustained. There can also be some overlap between these two elements - sometimes, you might want your kick to have a bit of low-end on it or your bassline to have higher frequencies for added attitude. It depends on the overall sound you're going for in your track.