opisthorchiasis vs infestation

opisthorchiasis and infestation both are nouns.

Word	Noun	Adjective	Verb	Adverb
opisthorchiasis	Yes	No	No	No
infestation	Yes	No	No	No

As nouns, infestation is a hypernym of opisthorchiasis; that is, infestation is a word with a broader meaning than opisthorchiasis:

opisthorchiasis: infestation with flukes obtained from eating raw fish; common in eastern Asia
infestation: the state of being invaded or overrun by parasites

opisthorchiasis (noun)	infestation (noun)
infestation with flukes obtained from eating raw fish; common in eastern Asia	a swarm of insects that attack plants
	the state of being invaded or overrun by parasites