Intervenor refers to a person or entity that voluntarily enters into a legal dispute between two parties in order to protect their interests or challenge the outcome. This term can also be replaced by similar expressions like participant, third-party, or litigant. Some other commonly used synonyms for intervenor are mediator, advocate, representative, or defender. These words offer a broader scope to the definition of intervenor and can be applied in different contexts. Regardless of the chosen term, the essence of intervenor remains the same - someone who interferes in a legal matter to safeguard their rights or intervene for the benefit of others.