immorality vs iniquity

immorality and iniquity both are nouns.

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

As nouns, immorality and iniquity are synonyms defined as:

Other synonyms of immorality include evil, wickedness.

immorality (noun)	iniquity (noun)
morally objectionable behavior	morally objectionable behavior
the quality of not being in accord with standards of right or good conduct	an unjust act