irritability vs fussiness

irritability and fussiness both are nouns.

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

As nouns, irritability and fussiness are synonyms defined as:

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

irritability (noun)	fussiness (noun)
a disposition to exhibit uncontrolled anger	unnecessary elaborateness in details
excessive sensitivity of an organ or body part	an irritable petulant feeling
an irritable petulant feeling