irritation vs pinprick

irritation and pinprick both are nouns.

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

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

Other hyponyms of irritation include bummer, huff, miff, seeing red, impatience, restlessness, snit.

irritation (noun)	pinprick (noun)
unfriendly behavior that causes anger or resentment	small puncture (as if made by a pin)
the act of troubling or annoying someone	a minor annoyance
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