Before turning to the various processes of making words, it would be useful to analyse the related problem of the composition of words, i. e. of their constituent parts.
If viewed structurally, words appear to be divisible into smaller units which are called morphemes. Morphemes do not occur as free forms but only as constituents of words. Yet they possess meanings of their own.
All morphemes are subdivided into two large classes: roots (or radicals} and affixes. The latter, in their turn, fall into prefixes which precede the root in the structure of the word (as in re-read, mis-pronounce, un-well) and suffixes which follow the root (as in teach-er, cur-able, diet-ate).
Words which consist of a root and an affix (or several affixes) are called derived words or derivatives and are produced by the process of word-building known as affixation (or derivation).
Derived words are extremely numerous in the English vocabulary. Successfully competing with this structural type is the so-called root word which has only a root morpheme in its structure. This type is widely represented by a great number of words belonging to the original English stock or to earlier borrowings (house, room, book, work, port, street, table, etc.), and, in Modern English, has been greatly enlarged by the type of word-building called conversion (e. g. to hand, v. formed from the noun hand; to can, v. from can, ï.; to pale, v. from pale, adj.; a find, n. from to find, v.; etc.).
Another wide-spread word-structure is a compound word consisting of two or more stems2 (e. g. dining-room, bluebell, mother-in-law, good-for-nothing). Words of this structural type are produced by the word-building process called composition.
The somewhat odd-looking words like flu, pram, lab, M. P., V-day, H-bomb are called shortenings, contractions or curtailed words and are produced by the way of word-building called shortening (contraction).
The four types (root words, derived words, compounds, shortenings) represent the main structural types of Modern English words, and conversion, derivation and composition the most productive ways of word-building.
To return to the question posed by the title of this chapter, of how words are made, let us try and get a more detailed picture of each of the major types of Modern English word-building and, also, of some minor types.