Scott is right but don't think we're being nit picky. Using the proper terminology in woodworking is critical. Of course it's easy to "misspeak" no matter how well you know the terminology - I am a great example I do it all the time unconsciously even though I know better consciously.
An easy way to remember the difference between "joint", "join" in woodworking is that the one with a "t" in it is the tool. It can powered machine like a jointer itself, or it can be a makeshift jointer such as a router with a straightedge. It can also be a hand plane. Jointing is the process of making the edge perfectly straight and square to the face (unless you're actually doing a bevel joint and wait on trying that for a while).
Joining (without the "t") two boards means mating them together in some way. Usually accomplished with glue and some kind of clamping/fastening process. A good edge glue-up will stay together once the clamps are removed and, provided the edges are not end grain, there is no need for "biscuits", "pocket screws", or even "splines".
So you jointing is a process of preparation, and joining is mating the board edges together. This is all generally speaking but trying to give a rough idea. It's all a lot easier to learn than it sounds if you have a keen interest.