untized washer and dryer
Got excited when I saw the posting of a free "combo" unit, ha. Sadly, it isn't a combo but a unitized washer and dryer.
Combo=combination washer and dryer=one drum/tub performs both functions
Unitized Washer and Dryer=dryer mounted vertically over washer in one cabinet (or one unit, hence the name)
Stacked Washer and Dryer (or Stackable Washer and Dryer): Like the old Westinghouse Laundromat System. Washer and dryer in two separate cabinets. The dryer has the option to be permanently or temporarily mounted on top of the washer.,