A prefix in m- is the most widely attested affix in AA that is used to derive nouns, and is one the features Joseph Greenberg used to diagnose membership in the family.
ɐ pɹˈiːfɪks ɪn ˈɛm ɪz ðə mˈoʊst wˈaɪdli ɐtˈɛstᵻd ɐfˈɪks ɪn ˌeɪˈeɪ ðæt ɪz jˈuːzd tə dᵻɹˈaɪv nˈaʊnz, ænd ɪz wˈʌn ðə fˈiːtʃɚz dʒˈoʊsəf ɡɹˈiːnbɜːɡ jˈuːzd tə dˌaɪəɡnˈoʊz mˈɛmbɚʃˌɪp ɪnðə fˈæmɪli.