Is this one of those situations where people confuse the name peltast (medium javelin armed skirmishers carrying a pelta type shield) with a peltast (any unit carrying a pelta type shield)?

I find the whole pelta-theuro-dory-hoplon nomenclature thing occasionally confusing. Is their an agreed harmonisation for ancient military terms? The EB nomenclature seems reasonably consistent, perhaps its that the source material is a bit loose with its definitions sometimes.