monorchidism vs cryptorchidy

monorchidism and cryptorchidy both are nouns.

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

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

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

Other hypernyms of monorchidism include cryptorchidism, cryptorchism.

monorchidism (noun)	cryptorchidy (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