I hate buzzwords as much as you do, but this is the best description I could come up with. I'd love to hear if you have a better idea.
i've always seen project management and lean as variations on common sense and kanban i've never really looked at to know what it is because i've prejudged the whole field it belongs to as a redundant - or for those too lazy to engage their brains.
if forced maybe "Effective, common sense management"? the whole "project" "specialisation" has always seemed redundant to me...
then again buzzwords do sell. so don't listen to me if you want to sell. the masses of businesses are what matter and they are generally the sort to buy things because of buzzwords rather than demonstrable results. :)