As nouns the difference between dryness and hoofbound
is that dryness is (uncountable) a lack of moisture while hoofbound is (dated) deformative contraction and dryness of the back part of the hoof of a horse.
dryness
English
Noun
(uncountable) A lack of moisture.
The degree to which something is dry.
hoofbound
English
Noun
(-)
(dated) Deformative contraction and dryness of the back part of the hoof of a horse.