Since OSM does not support tags like place=ward or place=commune, the most reasonable way to standardize this data for Vietnam is to tag wards as place=city and communes as place=town. This approach is consistent with OSM's documentation. As we have agreed on using admin_level=6 for the second-level administrative divisions of Vietnam, the OSM Wiki, https://wiki.openstreetmap.org/wiki/Key:place, indicates that place=city is a suitable tag for this level. Although place=subdistrict and place=municipality are also appropriate for admin_level=6, place=city is a more logical fit for wards. A ward cannot be tagged as place=suburb, which means "the edge of a large town or city" and translates to "Ngoại ô" in Vietnamese. For instance, a central area like a ward in Saigon is clearly NOT a "suburb." Similarly, communes cannot be tagged as place=village because many communes have large populations. Given that a commune is the same administrative level but below a ward, place=town is the next logical tag to use. To sum it up, this method provides the best way to standardize how all wards and communes are represented across Vietnam.