The term 'ADHERENT SUFFIX' can be solved by two three-letter words, 'IST' and 'ITE'. 'IST' is a suffix that is used to denote a person who practices or adheres to a particular ideology, belief, or custom. For example, a 'FEMINIST' is someone who believes in the social, political, and economic equality of the sexes. 'ITE' is another suffix that is used to denote a person who belongs to a particular group or organization. For example, a 'Rotarian' is someone who is a member of the Rotary International organization.