iniquity vs violation

iniquity and violation both are nouns.

Word	Noun	Adjective	Verb	Adverb
iniquity	Yes	No	No	No
violation	Yes	No	No	No

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

Other hyponyms of iniquity include devilry, deviltry, foul play, irreverence, sexual immorality.

iniquity (noun)	violation (noun)
morally objectionable behavior	a crime less serious than a felony
an unjust act	entry to another's property without right or permission
	the crime of forcing a person to submit to sexual intercourse against his or her will
	a disrespectful act
	an act that disregards an agreement or a right