monorchidism vs cryptorchidism

monorchidism and cryptorchidism both are nouns.

Word	Noun	Adjective	Verb	Adverb
monorchidism	Yes	No	No	No
cryptorchidism	Yes	No	No	No

As nouns, cryptorchidism is a hypernym of monorchidism; that is, cryptorchidism is a word with a broader meaning than monorchidism:

monorchidism: failure of one testes to descend into the scrotum
cryptorchidism: failure of one or both testes to move into the scrotum as the male fetus develops

Other hypernyms of monorchidism include cryptorchidy, cryptorchism.

monorchidism (noun)	cryptorchidism (noun)
failure of one testes to descend into the scrotum	failure of one or both testes to move into the scrotum as the male fetus develops