What are protons and neutrons called together?

The proton and neutron are in many ways similar particles. They belong to the same type of elementary particles – baryons, have the same spin and equally participate in the strong (nuclear) interaction. Their masses are very close. In modern physics, a proton and a neutron are considered as two states of one particle – a nucleon. These two states differ in the amount of electrical charge. A proton is a positively charged nucleon, and a neutron is a nucleon with zero electric charge.
Answer: the common name for proton and neutron is nucleon.