How do the Synonyms for Expense Type default?

Summary:

When a new Expense Type is created and Automatically Submit Expense Reports is run, the Expense Type becomes visible in Manage Auto Submission and Matching Options with a list of predefined synonyms. There seems to be a few predefined lists of synonyms and the system chooses one of them to assign to the new expense type. Where are these synonym lists defined?

Content (required):

Manage Auto Submission and Matching Options

Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):