genus Phthirius vs crab

genus Phthirius and crab both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Phthirius	Yes	No	No	No
crab	Yes	No	Yes	No

genus Phthirius (noun)	crab (noun)
true lice: crab lice	a stroke of the oar that either misses the water or digs too deeply
	decapod having eyes on short stalks and a broad flattened carapace with a small abdomen folded under the thorax and pincers
	a louse that infests the pubic region of the human body
	the edible flesh of any of various crabs
	a quarrelsome grouch

genus Phthirius (verb)	crab (verb)
	complain
	fish for crab
	scurry sideways like a crab
	direct (an aircraft) into a crosswind