misdeed vs irregularity

misdeed and irregularity both are nouns.

Word	Noun	Adjective	Verb	Adverb
misdeed	Yes	No	No	No
irregularity	Yes	No	No	No

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

misdeed: improper or wicked or immoral behavior
irregularity: behavior that breaches the rule or etiquette or custom or morality

misdeed (noun)	irregularity (noun)
improper or wicked or immoral behavior	behavior that breaches the rule or etiquette or custom or morality
	not characterized by a fixed principle or rate; at irregular intervals
	an irregular asymmetry in shape; an irregular spatial pattern
	irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis