pinprick vs vexation

pinprick and vexation both are nouns.

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

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

Other hypernyms of pinprick include annoyance, botheration, irritation.

pinprick (noun)	vexation (noun)
small puncture (as if made by a pin)	the act of troubling or annoying someone
a minor annoyance	something or someone that causes anxiety; a source of unhappiness
	anger produced by some annoying irritation
	the psychological state of being irritated or annoyed