classifier
🇺🇸
/ˈklæsɪfaɪər/
🇬🇧
/ˈklæsɪfaɪə(r)/
A word or part of a word that helps to group words with similar meanings. For example, 'un-' is a classifier that turns a word into its opposite, like 'unhappy'.
The prefix 'un-' is a common classifier used to create negative forms of adjectives.