We all know that slow and slowly are the adverbs and adjectives for slowness, meaining they all belong to say the same class or enitiy or I don't know what. Please can someone tell me if there is a name for such classes. I hope I made my ptint clear. Let me give another example;
Noun Adverb Adjectivelaudableness laudably laudable
Now laudatory is not a part of this class. So what is a formal word (if any) to define these classes.
GB