impetigo vs skin disease

impetigo and skin disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
impetigo	Yes	No	No	No
skin disease	Yes	No	No	No

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

impetigo: a very contagious infection of the skin; common in children; localized redness develops into small blisters that gradually crust and erode
skin disease: a disease affecting the skin

Other hypernyms of impetigo include disease of the skin, skin disorder.

impetigo (noun)	skin disease (noun)
a very contagious infection of the skin; common in children; localized redness develops into small blisters that gradually crust and erode	a disease affecting the skin