Unfortunately, when you get a bunch of moms together, they talk about what they know--which is their kids, and of course the comparing begins from there. That always feels like a competition to me, one of who's smartest, funniest, most clever, fastest, earliest to develop.
On the hyper portion, I too had a very active one that stood/stands out from the crowd. We had a difficult time finding a good fit in preschools, because not ever teacher can deal effectively with an active child. She's five now, and we even went so far at one point to take her to a counselor to be assessed (which is pretty bad, because that's what *I* am--and I was second guessing myself). Some of the same characteristics of ADHD children are the same characteristics of gifted children! THAT was much more welcome to hear than the, "she doesn't sit still", etc. 20 months is very young to diagnose ADHD, and some kids are just more active than others.
With the language, he's sounding like there's a lot that he's picking up. You might try insisting that he speak. Pick an easy item that he might gesture often for (like cup, or up). When he gestures for it, show it to him and say the word. Wait and give him a chance to try the word. Repeat it for him. If he makes any kind of effort or approximation at first, then give a praise and let him have the item. You can add more words as he starts to pick them up. You also want to "up the ante" on him, by making him say the word a little more clearly, obviously after he's making more efforts. He might get frustrated, but that's to be expected since you're making him really work for it. As he starts to talk more or try more, you'll get a better idea for yourself of how he's doing.
In my area, we have the First Words Project, http://firstwords.fsu.edu/index.html There is a USF link in there, so you might have a similar program in your area. It's a nice little evaluative language program, and we have a parent-child play group where they have child assessment and parent education.