dry rot vs plant disease

dry rot and plant disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
dry rot	Yes	No	No	No
plant disease	Yes	No	No	No

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

dry rot: a crumbling and drying of timber or bulbs or potatoes or fruit caused by a fungus
plant disease: a disease that affects plants

dry rot (noun)	plant disease (noun)
a fungus causing dry rot	a disease that affects plants
a crumbling and drying of timber or bulbs or potatoes or fruit caused by a fungus