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Text updated. Most English words longer than about 15-20 letters are scientific, meaningless, or highly specialized, and they tend to be formed by affixation. This is the act or process of adding affixes to a base word to produce a derivative word—in the word affixation, for instance, -ation is an affix. Here are some of the longest words.Most English words longer than about 15-20 letters are scientific, meaningless, or highly specialized, and they tend to be formed by affixation. This is the act or process of adding affixes to a base word to produce a derivative word—in the word affixation, for instance, -ation is an affix. Here are some of the longest words.