annoyance vs irritation

annoyance and irritation both are nouns.

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

As nouns, annoyance and irritation are synonyms defined as:

Other synonyms of annoyance include annoying, vexation.

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

Other hyponyms of annoyance include pique, temper, frustration, aggravation, exasperation, harassment, torment, displeasure.

As nouns, annoyance and irritation are synonyms defined as:

annoyance and irritation: the psychological state of being irritated or annoyed

Other synonyms of annoyance include botheration, vexation.

annoyance (noun)	irritation (noun)
the act of troubling or annoying someone	unfriendly behavior that causes anger or resentment
something or someone that causes trouble; a source of unhappiness	the act of troubling or annoying someone
anger produced by some annoying irritation	an uncomfortable feeling of mental painfulness or distress
an unpleasant person who is annoying or exasperating	a sudden outburst of anger
the psychological state of being irritated or annoyed	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