Gluon is a subatomic particle that helps to bind protons and neutrons together, forming atomic nuclei. While there are no direct synonyms for gluon, there are related terms that are often used in the field of particle physics. For example, quarks are another subatomic particle that interacts with gluons to form protons and neutrons. Additionally, some physicists might refer to the strong nuclear force instead of gluons when discussing the binding of subatomic particles. While these terms are not exact synonyms for gluons, they are interrelated concepts that are often discussed together in the world of physics.