irritability vs pettishness

irritability and pettishness both are nouns.

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

As nouns, irritability and pettishness are synonyms defined as:

irritability and pettishness: a disposition to exhibit uncontrolled anger

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

irritability (noun)	pettishness (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