irritability vs fretfulness

irritability and fretfulness both are nouns.

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

As nouns, irritability and fretfulness are synonyms defined as:

Other synonyms of irritability include choler, crossness, fussiness, peevishness, petulance.

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