For derivational nouns, if we look at various properties of affixes, I understand they exhibit both affix polysemy and affix homonymy. By polysemy I understand that the the same affix is used in multiple instances of same semantic sense, like Indian, American, African etc. all having the same semantic sense.
Also by affix homonymy I understand usage of same affix in unrelated semantic sense like Librarian, Comedian. Here you cant have the semantic sense attached to both Comedian and Library with its source words Library and Comedy.
Are these notions correct? or Am I missing something?