【正确答案】：
AFFIXES ATTACHED TO THE END OF WORDS TO INDICATE GRAMMATICAL RELATIONSHIPS ARE INFLECTIONAL, THUS KNOWN AS INFLECTIONAL MORPHEMES. WHILE DERIVATIONAL AFFIXES ARE AFFIXES ADDED TO OTHER MORPHEMES TO CREATE NEW WORDS. 
【题目解析】：词缀附在词尾以表示语法关系是屈折的，因此被称为屈折词素。而派生词缀则是在其他词素中添加词缀来创造新词。