Defining concepts:

• affix
• root

Related features:

• Prefixing vs. suffixing in inflectional morphology (WALS)
• Do verbs have prefixes/proclitics, other than those that only mark A, S or P (do include portmanteau: A & S + TAM)? (Grambank)
• Can adnominal possession be marked by a prefix on the possessed noun? (Grambank)