substance abuser substance abuse • substanceless · · · Info · Definitions · Synonyms · Characters · · substance abuser · · Text Common · · Latin · · Scripts 16 · · Length 5 · · Syllables Definitions · · · (noun) a person who takes drugs. Synonyms: drug user, substance abuser, user. · · Noun Definition 1 Synonyms · · · drug user · · Synonym 1 user · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075