Lymphadenopathy is a term meaning "disease of the lymph nodes." It is, however, almost synonymously used with "swollen/enlarged lymph nodes". It could be due to infection, auto-immune disease, or malignancy.
Inflammation of a lymph node is called lymphadenitis. In practice, the distinction between lymphadenopathy and lymphadenitis is rarely made. Inflammation of lymph channels is called lymphangitis.
Read more about Lymphadenopathy: Types, Cause, Benign (reactive) Lymphadenopathy, Bilateral Hilar Lymphadenopathy