Simple goitre is an enlargement of the thyroid gland, which gets visible as swelling in the neck region due to deficiency of iodine in the diet.
Cretinism is a disorder in children due to the hyposecretion of thyroid hormones from childhood from the thyroid gland.
Exophthalmic goitre is a disorder which is due to hyposecretion of the thyroid. It is accompanied goitre with bulging eyes.
Diabetes is a disease caused by a deficiency of insulin. It is due to cells of pancreatic islets do not produce insulin.
Simple goitre, Cretinism, and Exophthalmic goitre are diseases due to hyposecretion or hypersecretion of the thyroid whereas diabetes is due to hyposecretion of insulin from Pancreas.