endospore-forming bacteria(n = noun.animal) - a group of true bacteria;
is a kind of eubacteria, eubacterium, true bacteria

bacteria, bacteria bed, bacteria family, bacteria genus, bacteria order, bacteria species, enteric bacteria, gliding bacteria, nitric bacteria, nitrous bacteria, penicillin-resistant bacteria, phototrophic bacteria, phototropic bacteria, potato scab bacteria, purple bacteria, pus-forming bacteria, ring rot bacteria, slime bacteria, sulfur bacteria, sulphur bacteria, true bacteria