19. The system of claim 16 , wherein the instructions further cause the processor to perform processing comprising, for the at least one of the plurality of telephone calls: analyzing the audio data to identify at least one acoustic characteristic of the speech of the telephone caller; comparing the at least one acoustic characteristic of the speech of the telephone caller to the plurality of word clusters; wherein the determining the most similar word cluster of the plurality of word clusters to the audio data is further based on a similarity of the at least one acoustic characteristic of the speech of the telephone caller and the at least one associated acoustic characteristic of the most similar cluster.
19. The system of claim 16 , wherein the instructions further cause the processor to perform processing comprising, for the at least one of the plurality of telephone calls: analyzing the audio data to identify at least one acoustic characteristic of the speech of the telephone caller; comparing the at least one acoustic characteristic of the speech of the telephone caller to the plurality of word clusters; wherein the determining the most similar word cluster of the plurality of word clusters to the audio data is further based on a similarity of the at least one acoustic characteristic of the speech of the telephone caller and the at least one associated acoustic characteristic of the most similar cluster. 20. The system of claim 19 , wherein the analyzing the audio data to identify at least one acoustic characteristic of the speech of the telephone caller comprises: correlating each of a plurality of portions of an acoustic or frequency component of the audio data with each of at least a subset of the plurality of words; and determining at least one acoustic characteristic for how the telephone caller says at least one of the subset of the plurality of words based on the portion of the acoustic or frequency component of the audio data correlated with the at least one of the subset of the plurality of words.