In more complex cases the result of the analysis at the two levels sometimes seems even to contracted one another.

The derivational types of words are classified according to the structure of their stems into simple, derived and compound words.

Derived words are those composed of one root- morpheme and one or more derivational morpheme.

Compound words contain at least two root- morphemes, the number of derivational morphemes being insignificant.

Derivational compound is a word formed by a simultaneous process of composition and derivational.

Compound words proper are formed by joining together stems of word already available in the language.