Noun
One who relates; a relater.
A private person at whose relation, or in whose behalf, the attorney-general allows an information in the nature of a quo warranto to be filed.
Source: Webster's dictionaryIn a qui tam action, the citizen filing suit is called a "relator". Source: Internet
In addition, there is a "relator" (which can be of multiple lexical categories, but is most commonly an affix or adposition). Source: Internet
The FCA requires each relator to supply the Government with a statement of material evidence ("SME") containing all information and documents they possess that support the FCA allegations. 31 U.S.C. § 3730(b)(2). Source: Internet