irritation vs mistreatment

irritation and mistreatment both are nouns.

Word	Noun	Adjective	Verb	Adverb
irritation	Yes	No	No	No
mistreatment	Yes	No	No	No

As nouns, mistreatment is a hypernym of irritation; that is, mistreatment is a word with a broader meaning than irritation:

irritation (noun)	mistreatment (noun)
unfriendly behavior that causes anger or resentment	the practice of treating (someone or something) badly
the act of troubling or annoying someone
an uncomfortable feeling of mental painfulness or distress
a sudden outburst of anger
the psychological state of being irritated or annoyed
the neural or electrical arousal of an organ or muscle or gland
(pathology) abnormal sensitivity to stimulation