15. The system as recited in claim 13 , wherein the comparator identifies the synonymous expression of the target non-facial-based expression based on the metric.
15. The system as recited in claim 13 , wherein the comparator identifies the synonymous expression of the target non-facial-based expression based on the metric. 16. The system as recited in claim 15 , wherein the comparator ranks the images based on the metric and select a synonymous expression candidate associated with a most frequent candidate image as the synonymous expression.