Home » Word structure » Derivation

Topic: Derivation

These resources cover the ways in which new words can be formed, for example by joining two words together or adding an ending to a word. These processes increase the vocabulary of our language, and an understanding of these processes can be helpful in expanding our personal vocabulary knowledge.

Spelling: Suffixes

Suffixes cause many of our common spelling mistakes. One challenge is simply to know which is correct: for example, legible or legable? In fact, −ible and −able serve the same function, and sound the same. As a matter of history, -ible entered English from Latin, while −able entered English from French, but there’s no easy rule for knowing when to use which suffix. Each word with each suffix just requires practice.

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Spelling: Suffixes and 'e'

If an original word ends in a final e, as in manage,adding a suffix will sometimes require that you drop the final e in the root word.

  • Drop the final e: managing
  • Keep the final e: management

How do you know when to drop the final e?

First, consider the following examples, which either drop or keep the final e.

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Spelling: Suffixes and 'y'

When a word ends in y, adding a suffix will sometimes require that we change the y to an i or to an ie. How do you know when to change the y?

Look through the examples below and the rules that follow.

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Word structure

The study of word structure is called morphology. Understanding word structure helps us:

  • improve spelling
  • expand vocabulary

In studying word structure, we start by looking at a few key concepts first:

  • root words
  • prefixes
  • suffixes

Root words are words, or parts of words, that can usually stand alone. The following are all root words:

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Word structure: Compounds

Compounds are combinations of root words, i.e. words that can occur on their own, to form a new established combination. They are sometimes spelt as one word, but also with a hyphen or as two words.

In English compound nouns, e.g. bookcase, laptop, smartphone, and compound adjectives, e.g. dripping wet, tax-free, are very common.

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Word structure: Derivation

Derivation is the process of creating new words. The technical term derivational morphology is the study of the formation of new words. Here are some examples of words which are built up from smaller parts:

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