Chronic Obstructive Lung Disease includes group of pathological conditions with chronic, partial / complete, obstruction of the airflow at any level from trachea to the smallest air ways resulting in functional disability of the lungs
Entities which are included in COPD are
Chronic bronchitis
Emphysema
Bronchial asthma
Bronchiectasis
Bronchiolitis
Reference
Vinay kumar, Abul K.Abbas, Nelson Fausto, Jon C. Aster. Robbins and Cotran Pathologic basis of disease. 8th edition