Suffix is called derivational if it changes word's class (e.g. noun from verb) or alter it's meaning preserving the class (like English adjectives red–reddish). Nûrlâm doesn't have many of such suffixes because word derivation is usually done by clitics (e.g. short adjectives, postpositions), phonetical alteration (changing vowel length, shifting consonants, h↔kh↔k↔g↔gh) or making compound words. Another reason is frequent zero-derivation (also called conversion), when no suffix is used to convert word's class (e.g. blûz has meaning of noun “grain” and verb “to grind”). Some English words have no direct correspondence in Nûrlâm, and another part of speech or expression is applied for translation (for example adjective “fearful” should be translated as “full of fear” = “gûk ufurob” or as participle “frightening” = “uglug” and adverb “fearfully” as “with fear” = “ufursha”).

Finally a table of common derivational suffixes:

As participles are considered as separate forms of verbs, their suffixes are not shown here, but in the table of inflectional suffixes.

There may be some irregularities in application of derivational suffixes, almost impossible to rationalize. For example one may assume that “matûrz” means “dead” from “mat-” (to die), but it actually means “mortal”, while “dead” is translated with active past participle (“matuga”). Adjectives like foolish or friendly may be translated with noun in Essive case (resulting “globsi” and “shauksi” respectively), thus “my friendly advice is to…” ⇒ “I advice you as a friend to …” = “Dathrâham shauksi (gerundive)”.