Random Med Questions-narcotics and IV push

I have a couple random questions regarding medications...first off..

Can someone break down some of the narcotic pain meds to me? Norco, Dilaudid, Morphine...what are the differences between these? I have heard Dilaudid is really strong and the "big cheese" of pain meds so to speak while a lot of patients don't like morphine b/c of side effects or it makes them feel "weird"...a lot of this info is what I hear nurses with experience say, not necessarily text books. Nurses who have experience with a lot of pain meds-can you break some of the commonly used ones down for me and why they would be prescribed to certain pts over other meds?

Also, what are some meds that you automatically know not to give quickly through IV push (I know potassium needs to be diluted and given slowly, Lasix too) but what are some other ones? Everytime I give a med IV push I try to do it a little slow but I guess it isn't necessary for all meds...

Thanks for your help and input