tetchiness vs choler

tetchiness and choler both are nouns.

Word	Noun	Adjective	Verb	Adverb
tetchiness	Yes	No	No	No
choler	Yes	No	No	No

As nouns, choler is a hypernym of tetchiness; that is, choler is a word with a broader meaning than tetchiness:

Other hypernyms of tetchiness include crossness, fretfulness, fussiness, irritability, peevishness, petulance.

tetchiness (noun)	choler (noun)
feeling easily irritated	a humor that was once believed to be secreted by the liver and to cause irritability and anger
	a strong emotion; a feeling that is oriented toward some real or supposed grievance
	an irritable petulant feeling