The editor shows that hamlets get a bigger font, same size like towns. Villages gets a smaller font. See a screenshot in Basecamp below.
Area is http://www.openstreetmap.org/?lat=52.2186&lon=5.4076&zoom=13&layers=M
Map is Lambertus’ world map without typ file. In Mapsource 6.16.3 it shows the same, although in MS the streetnames are too prominent.
The problem with garmin is that you aint see what you get when you look at the map on the GPS, it can be a totally different story 
Hamlets are in bold fonts, like Doornsteeg, Achterhoek, De Veenhuizen and Palestina. Holk is a village, Nijkerk a town.