Syndrome:
Syndrome can be described as a group of symptoms that together are characteristic of a specific disorder, disease, or the like.
Disease:
Disease is any harmful, depraved, or morbid condition (a state of not well-being), as of the mind or considered by the society.
Disorder:
Disorder is nothing but a disturbance in physical or mental health or functions; malady or dysfunction
There is no difference. The correct term is schizoaffective disorder. Schizoeffective disorder is a misspelling.
Illness means a subjective distressing feeling of a person. Disease is a physical pathology in a person Disorder is usually used in Psychiatry where there is no physical involvement but it is a disturbance of function, structure, or both such as in depressive disorder
the number of depressive and manic episodes.
Bipolar disease refers to someone who has sudden and severe mood swings. They have no control over these emotions and are sometimes very irrational during these times. OCD, aka Obsessive Compulsive Disorder, refers to someone who is obsessive about something. These people need to do repetitive things throughout their day. See "Difference between ADD and OCD"
its a disorder
Disorder
Mental disturbance is milder (insomnia due to stress). Mental disorder is more severe (anxiety disorder). Mental disease is severest (schizophrenia). The line of treatment, the prognosis differs.
A somatic disorder is a malfunction of the body. A psychosomatic disorder is a disorder of (most commonly) the body caused by a psychological factor (the mind).
Its a Disease
Plague is one form of infectious disease.
Asthma is a disorder
Disease is any change from a state of health; impaired body function.