sand crack vs animal disease

sand crack and animal disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand crack	Yes	No	No	No
animal disease	Yes	No	No	No

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

sand crack (noun)	animal disease (noun)
a fissure in the wall of a horse's hoof often causing lameness	a disease that typically does not affect human beings