R. S. Ginzburg, S. S. Khidekel, G. Y. Knyazeva, A. A. Sankin a course in modern english

§ 6. Derivative Structure

The analysis of the morphemic composition of words defines the ultimate meaningful constituents (UCs), their typical sequence and arrangement, but it does not reveal the hierarchy of morphemes making up the word, neither does it reveal the way a word is constructed, nor how a new word of similar structure should be understood. The morphemic analysis does not aim at finding out the nature and arrangement of ICs which underlie the structural and the semantic type of the word, e.g. words unmanly and discouragement morphemically are referred to the same type as both are segmented into three UCs representing one root, one prefixational and one suffixational morpheme. However the arrangement and the nature

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of ICs and hence the relationship of morphemes in these words is different — in unmanly the prefixational morpheme makes one of the ICs, the other IC is represented by a sequence of the root and the suffixational morpheme and thus the meaning of the word is derived from the relations between the ICs un- and manly- (‘not manly’), whereas discouragement rests on the relations of the IC discourage- made up by the combination of the. prefixational and the root-morphemes and the suffixational morpheme -ment for its second IC (’smth that discourages’). Hence we may infer that these three-morpheme words should be referred to different derivational types: unmanly to a prefixational and discouragement to a suffixational derivative.

The nature, type and arrangement of the ICs of the word is known as its derivative structure. Though the derivative structure of the word is closely connected with its morphemic or morphological structure and often coincides with it, it differs from it in principle.