A hadron and an antimatter particle are fundamentally different concepts in particle physics.
A hadron is a type of particle that experiences the strong nuclear force. It is composed of quarks, which are elementary particles that come in six flavors: up, down, charm, strange, top, and bottom. Hadrons can be classified into two categories: baryons and mesons.
Baryons: Baryons are hadrons made up of three quarks. Protons and neutrons, which are the building blocks of atomic nuclei, are examples of baryons. Protons consist of two up quarks and one down quark, while neutrons consist of one up quark and two down quarks.
Mesons: Mesons are hadrons made up of a quark and an antiquark. An antiquark is the antiparticle counterpart of a quark. Mesons have a shorter lifespan compared to baryons and are involved in the strong nuclear force.
On the other hand, antimatter particles are the antiparticles corresponding to ordinary matter particles. Every known elementary particle has an antimatter partner with the same mass but opposite charge. When a particle collides with its corresponding antiparticle, they can annihilate each other, releasing energy in the process. For example, the antiparticle of an electron (a fundamental particle) is called a positron. When an electron and a positron collide, they annihilate each other, producing energy in the form of gamma rays.
In summary, hadrons are a class of particles composed of quarks, while antimatter particles are the antiparticles of ordinary matter particles. While hadrons can be made up of quarks and antiquarks, antimatter particles exist for all types of elementary particles and have opposite charge and other quantum properties to their matter counterparts.