In Dutch, it is possible (with few exceptions) to take an adjective denoting a property, and add a suffix -erd to make it into a noun denoting 'a person who possesses this property'. Some examples:
slim - slimmerd = 'smart - smart.person'
dik - dikkerd = 'fat - fat.person'
gemeen - gemenerd = 'mean - mean.person'
vies - viezerd = 'dirty - dirty.person'
Do you know any other languages with a similar morphological operation? I think (but don't trust me on this) that Swedish can do it with -is, and perhaps Japanese with -mono? Does anyone have other examples?