for me, a bite is more like a pull, and for rocks is like taps, a hit will feel a little pull,, its a very small margin of difference, that's in my opinion,,,
Someone once asked me your question and I couldn't give them an answer. With more time bottom bouncing you will be able to tell. Remember hook sets are free.
depends on what style of fishing you're doing, if spin fishing a hard sudden stop is usually bottom, a quick tap tap tap and hard shaking pull is a bite, float fishing on a bite, you're float will just disappear on a bite, with bottom it will slowly drag under the water with the top facing the same direction as the current flow
usually a bottom bounce is more of a steady down up bump with no real erratic movement involved to it.. where as bites are more twitchy and sudden and violent if that makes sense.. more deliberate
usually after 2 or 3 drifts on the same spot you can tell where the bottoms gonna bump by memory and then your'e golden