quick temper vs irascibility

quick temper and irascibility both are nouns.

Word	Noun	Adjective	Verb	Adverb
quick temper	Yes	No	No	No
irascibility	Yes	No	No	No

As nouns, quick temper and irascibility are synonyms defined as:

Other synonyms of quick temper include short temper, spleen.

quick temper (noun)	irascibility (noun)
a feeling of resentful anger	a feeling of resentful anger