pinprick vs irritation

pinprick and irritation both are nouns.

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

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

Other hypernyms of pinprick include annoyance, botheration, vexation.

pinprick (noun)	irritation (noun)
small puncture (as if made by a pin)	unfriendly behavior that causes anger or resentment
a minor annoyance	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