molest vs nark

molest is not a noun while nark is a noun.

Word	Noun	Adjective	Verb	Adverb
molest	No	No	Yes	No
nark	Yes	No	Yes	No

As verbs, nark is a hypernym of molest; that is, nark is a word with a broader meaning than molest:

Other hypernyms of molest include annoy, bother, chafe, devil, get at, get to, gravel, irritate, nettle, rag, rile, vex.

molest (noun)	nark (noun)
	an informer or spy working for the police
	a lawman concerned with narcotics violations

molest (verb)	nark (verb)
annoy continually or chronically	inform or spy (for the police)
harass or assault sexually; make indecent advances to	cause annoyance in; disturb, especially by minor irritations