CATARRH:

Inflamation of mucous membranes,especially those of the air passages, associated with mucoid exudate.

CORYZA:

1. Inflammation of the mucous membranes of the nose, usually marked by sneezing and discharge of watery mucous.
2. Sometimes the common cold.

In the case of catarrh one can have; catarral conjunctivitis, catarral jaundice, catarral otis media.

Corya is associated with the nose as in the common cold.

Hope this may help someone still confused.

Regards Scruffrat