pediculosis vs crabs

pediculosis and crabs both are nouns.

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

As nouns, crabs is a hyponym of pediculosis; that is, crabs is a word with a more specific, narrower meaning than pediculosis:

pediculosis: infestation with lice (Pediculus humanus) resulting in severe itching
crabs: infestation of the pubic hair by crab lice

Other hyponyms of pediculosis include head lice, pediculosis capitis, pediculosis corporis, pediculosis pubis.

pediculosis (noun)	crabs (noun)
infestation with lice (Pediculus humanus) resulting in severe itching	infestation of the pubic hair by crab lice