Affixational is a term used to describe the process of adding a prefix or suffix to a word in order to change its meaning. Some synonyms for affixational include derivational, morphological, and structural. Derivational refers to the creation of new words through adding prefixes, suffixes, or other affixes. Morphological refers to the changes in word forms and structures caused by affixes. Structural refers to the changes in the construction of words caused by affixes. All of these terms describe the same process of word formation that involves the addition of affixes to existing words. Understanding these synonyms can help you better understand the role of affixes in language.