choler vs tetchiness

choler and tetchiness both are nouns.

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

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

Other hyponyms of choler include testiness, touchiness, pet.

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