McD's uses ground, molded chicken to make their 'nuggets. If you buy frozen nuggets in the grocery, you are getting a similar product. If you order anything called 'nuggets in a restaurant, you can expect the same, but a FEW places will actually used cut up chunks of chicken, and you can bet they will tell you so on the menu.
Chicken tenders are the tenderloin. Chicken strips could be either the tenderloin or slices of breast meat.
Boneless wings are a relatively new phenomenom. It's a marketing thing. Chicken strips often have a connotation of being a kids' meal, and they are usually cheaper than an adult meal on a menu. Whereas, wings are a guys'-football-poker-bar night snack. Depending on where you live in the country, you pay $2 for a wing that only weighs 2-3 ounces. Translate that into a moneymaker.
Each chicken only has 2 wings, but you can get many cut up strips of breast meat, especially since they now breed chickens so large. So some marketing genius decided to cut the breast into wing-sized pieces and market them as 'boneless wings'. Brilliant! Now they can charge the price for wings, while selling a repackaged kid's meal.
But in the end, boneless wings are still just chicken breast strips (not ground meat and not wings.)