What is the difference between a lymph node and a lymph nodule?

Semantics: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes/nodules "taste" lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, the immune system reacts and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.