Ray, First off, don't apologize for asking questions. We all had to start somewhere and the the only dumb question is the one that was never asked.
On the chart look for the part right above the picnic that's marked, "Boston Shoulder." That's the butt. Also known as Boston butt, pork shoulder butt, pork butt, and on and on. On the chart, it is also referred to as "Shoulder Roast." Never heard that one before but I learn something new every day.
One thing you'll learn when dealing with cuts of meat is that the names can be regional. Case in point: "Country Style Ribs" means different things in different parts of the country. Same thing with the term, "Pork Steak." The terminology is kind of like shooting at moving target but you'll get used to it. Just hang in there and keep asking questions. Somebody will come to your rescue.