Subatomic particles are the smallest particles known to exist and are the building blocks of all matter. Mesons (6 letters) are particles composed of one quark and one antiquark, Leptons (7 letters) are fundamental particles that do not interact through the strong force, Muons (5 letters) are leptons with a negative electric charge, Pions (5 letters) are mesons that are composed of a quark and an antiquark, Ions (4 letters) are atoms or molecules with a net electric charge, Neutrons (8 letters) are uncharged particles found in the nucleus of an atom, Quarks (6 letters) are the fundamental particles that make up protons and neutrons, and Bosons (6 letters) are particles that mediate the forces between particles.