Typically, when I was dming, I called them potions of healing, because that is what I handed out: potions that heal. Oh, sure they may have different potencies, but they all heal. I seldom even mentioned to the players what kind of potion of healing they got (though it's pretty easy for them to figure out). If they used one, they'd have to tell me the description of the potion they're drinking: the milky, blue potion of healing in the cut glass vial (cure light wounds), the turquoise blue potion of healing in the silver chased vial (cure moderate wounds), etc. It seems to add to the atmosphere and hasn't interfered with the game flow yet.