firebug vs crook

firebug and crook both are nouns.

Word	Noun	Adjective	Verb	Adverb
firebug	Yes	No	No	No
crook	Yes	No	Yes	No

As nouns, crook is a hypernym of firebug; that is, crook is a word with a broader meaning than firebug:

firebug: a criminal who illegally sets fire to property
crook: someone who has committed a crime or has been legally convicted of a crime

Other hypernyms of firebug include criminal, felon, malefactor, outlaw.

firebug (noun)	crook (noun)
a true bug: brightly colored bug that can exude a stain	a long staff with one end being hook shaped
a criminal who illegally sets fire to property	someone who has committed a crime or has been legally convicted of a crime
	a circular segment of a curve

firebug (verb)	crook (verb)
	bend or cause to bend