occupational disease vs disease

occupational disease and disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
occupational disease	Yes	No	No	No
disease	Yes	No	No	No

As nouns, disease is a hypernym of occupational disease; that is, disease is a word with a broader meaning than occupational disease:

occupational disease: disease or disability resulting from conditions of employment (usually from long exposure to a noxious substance or from continuous repetition of certain acts)
disease: an impairment of health or a condition of abnormal functioning

occupational disease (noun)	disease (noun)
disease or disability resulting from conditions of employment (usually from long exposure to a noxious substance or from continuous repetition of certain acts)	an impairment of health or a condition of abnormal functioning