Certifiers are professionals who verify or attest to the authenticity or reliability of certain objects, services, or qualifications. There are several other synonyms that can be used to describe such professionals. For instance, "attesters" suggest an individual who formally confirms the legality or truthfulness of a particular document or declaration. "Accreditors" refer to professionals who verify and approve the competencies of an organization or individual. "Assessors" are experts who evaluate or examine the qualities and abilities of an object, individual, or process. Other synonyms that describe certifiers include "verifiers," "validators," "authenticators," "endorsers," or "witnesses." These synonyms are commonly used interchangeably with certifiers, depending on the context of their application.