Comparison with Other Term List Functions Comparison with Other Term List Functions The following table compares functions that you can use with term lists: Function Purpose Return Value %LOOKUP Looks up a value, given the key of a term list item. Returns the value of the term list item. You can specify a default value to return. A number or a string (which could be the name of a member). LOOKUP Returns a field from a term list item. By default, this field is the key field, but you can return another field instead. You can specify a default value to return. %TERMLIST Returns a set based on the given term list. Returns a set.