pediculosis vs infestation

pediculosis and infestation both are nouns.

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

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

pediculosis: infestation with lice (Pediculus humanus) resulting in severe itching
infestation: the state of being invaded or overrun by parasites

pediculosis (noun)	infestation (noun)
infestation with lice (Pediculus humanus) resulting in severe itching	a swarm of insects that attack plants
	the state of being invaded or overrun by parasites