pettishness vs irritability

pettishness and irritability both are nouns.

Word	Noun	Adjective	Verb	Adverb
pettishness	Yes	No	No	No
irritability	Yes	No	No	No

As nouns, pettishness and irritability are synonyms defined as:

pettishness and irritability: a disposition to exhibit uncontrolled anger

Other synonyms of pettishness include biliousness, peevishness, snappishness, surliness, temper.

pettishness (noun)	irritability (noun)
a disposition to exhibit uncontrolled anger	a disposition to exhibit uncontrolled anger
	excessive sensitivity of an organ or body part
	an irritable petulant feeling