15. A system comprising: a repository comprising one or more tables, the tables comprising entries with a substitution unit corresponding to a target term, the entries arranged according to a prioritized scheme that defines a position for the substitution unit in the tables; and a computing device in communication with the repository, the computing device comprising a processor, memory coupled with the processor, and executable instructions stored on the memory and configured to be executed by the processor, the instructions for, accessing the one or more tables in the repository, and generating an output comprising data that represents the substitution unit to be utilized by a text-to-speech generator to generate spoken content, wherein the position of the substitution unit in the one or more tables is assigned based on a specificity characteristic that describes the relative inclusivity of the substitution unit as compared to other substitution units in the one ore more tables.
15. A system comprising: a repository comprising one or more tables, the tables comprising entries with a substitution unit corresponding to a target term, the entries arranged according to a prioritized scheme that defines a position for the substitution unit in the tables; and a computing device in communication with the repository, the computing device comprising a processor, memory coupled with the processor, and executable instructions stored on the memory and configured to be executed by the processor, the instructions for, accessing the one or more tables in the repository, and generating an output comprising data that represents the substitution unit to be utilized by a text-to-speech generator to generate spoken content, wherein the position of the substitution unit in the one or more tables is assigned based on a specificity characteristic that describes the relative inclusivity of the substitution unit as compared to other substitution units in the one ore more tables. 17. The system of claim 15 , wherein the one or more tables include a first table and a second table that comprise, respectively, a first entry and a second entry, and wherein the substitution unit of the first entry is different from the substitution unit of the second entry.