The five senses are [1] sight, [2] sound, [3] smell, [4] taste and [5] touch. Known, in Hinduism, where it comes from, as the "Pancha-indriyas".
The "sixth sense" is that feeling you get that you are being watched, or that you will slip and fall; which is actually the 5 senses working together and giving you imperceptible information. We call it "intuition" I forgot the Hindu word for that, since it's a tongue twister.
The seventh sense is what we know as premonition, ESP, if you want to call it that, when you just know that something is going to happen; which has no relation with the 5 senses like the "sixth" sense has. The Hindu word for this is another tongue twister and I forgot that as well.
Hope this helped.
Cheers.