deficiency disease vs disease

deficiency disease and disease both are nouns.

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

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

deficiency disease: any disease caused by a lack of an essential nutrient (as a vitamin or mineral)
disease: an impairment of health or a condition of abnormal functioning

deficiency disease (noun)	disease (noun)
any disease caused by a lack of an essential nutrient (as a vitamin or mineral)	an impairment of health or a condition of abnormal functioning