crabs vs lousiness

crabs and lousiness both are nouns.

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

As nouns, lousiness is a hypernym of crabs; that is, lousiness is a word with a broader meaning than crabs:

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

Other hypernyms of crabs include pediculosis.

crabs (noun)	lousiness (noun)
infestation of the pubic hair by crab lice	the quality of being disgusting to the senses or emotions
	infestation with lice (Pediculus humanus) resulting in severe itching