vexation vs bummer

vexation and bummer both are nouns.

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

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

Other hyponyms of vexation include huff, miff, seeing red, pinprick, impatience, restlessness, snit.

vexation (noun)	bummer (noun)
the act of troubling or annoying someone	an experience that is irritating or frustrating or disappointing
something or someone that causes anxiety; a source of unhappiness	a bad reaction to a hallucinogenic drug
anger produced by some annoying irritation
the psychological state of being irritated or annoyed